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Want to know what synthetic oil is better for older cars? You have heard about how good it is for other cars to switch to using these oils instead of regular oils for better performance. But you have a rather old but well-maintained car which runs well and has run more than 100,000 miles. So you naturally wonder if you can or should start using this oil in it and which oil is best for your car. If you need some help here, the following information should help clear your doubts and apprehensions because you need to choose the perfect oil for a vehicle that has run so many miles.
In a Hurry – Here’s Our Top Synthetics
And Our Top Conventional Motor Oils
Preview | Product | Rating | |
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Lucas Oil 10679 Hot Rod & Classic Car SAE 10W-30... | Check Availability << | |
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Quaker State Motor Oil, Synthetic Blend 5W-30... | Check Availability << |
Synthetic oils
These are artificially made using chemical compounds, which is a contrast to conventional motor oil made from refined crude oil. There are two types of synthetics:
Full synthetic oil
This oil is blended using different types of additives to provide the best engine protection and for improved vehicle’s performance. These oils use the best-performance additives and fluids. While all they are not equal, its brand and density don’t matter much.
Semi-synthetic oils
This type is also called synthetic blends which are a mix of mineral and not more than 30|% synthetic oil. It’s better than conventional oils and much more advantageous than full synthetic oils without the expense.
When your engine grows old
The engine tends to grow weaker as it grows old and doesn’t respond well to normal wear and tear. This is when it’s important that you regularly change oil otherwise the trapped contaminants will end up damaging motor parts. It’s only with regular oil changes that the aged parts are properly lubricated to prevent any possible premature motor failure.
Recommended synthetic oils for older cars
Full synthetic oils are always a good choice for older vehicles that have been used a lot. They are perfect for lubricating motor parts as they do it much better than any other oil. And in the process they helped increase your car’s fuel economy, reduce the emissions and in the process help increase the automotives lifespan.
The only problem with using it for your car is that these oils are thinner than conventional types. So this can lead to the oil bleeding more with time. This problem can however be rectified if you use a full synthetic oil that has a higher viscosity.
High-mileage oil
It is worth switching to high mileage oil if your car has been fun for more than 75,000 miles. The benefit and reason for using this oil are because it contains many additives which can help seal, and stop possible leakage. It also helps reduce friction in the engine and holds an important role in reducing the amount of sludge deposited. And in the long process it protects your motor so that it works better.
Benefits of using synthetic oils in older vehicles
You can reap the benefits of this type in older vehicles as long as your vehicle is in good running condition and has minimal leaks. Some people are hesitant about using these oils because they think that it may only trigger some problems. The main reason for this confusion is because the benefits of synthetic oil has a lower viscosity than conventional motor oil, and is more slippery oil. Some also worry that the oil may not be compatible with seals and can leak in some places while conventional may not.
However all this is a misconception because this oil does protect the engine in aged vehicles as well as they do the newer models. Besides, most synthetic motor oils are more compatible thanks to its modern seal materials. And as most synthetics are formulated to condition seals they can be adjusted to prevent leaks.
Benefits of switching to synthetic oils
There is no particular formula or procedure for making the switch. However, as a precautionary measure, it’s better to first do an engine flush so that it is clean and free of any accumulated contaminants which eventually affect the synthetic motor oil’s life. However, this is not a steadfast rule and it’s rather easy switching to using synthetic oils in all automotivies.
Some people worry about making a switch to using full synthetic oil because they fear it can lead to the cleaning and loosening of sludge from the motor. And if all this isn’t removed it can end up plugging the oil filter and passageways. This is also false because there will not be any clogging of oil filter or passageways when you switch to using a modern oil from a conventional motor oil.
It is true older cars have a tendency to form engine sludge and their oil seals and gaskets aren’t as tight as newer cars. This works as a sealing mechanism so when a synthetic oil is used, its advanced detergent additive cleans it out. So there’s a chance of some of the debris which worked as a seal of getting removed. And this can lead to an oil leak.
However, this doesn’t imply you shouldn’t change from using a conventional to a modern oil in your old car. You just have to note your car’s oil usage after making the switch and perhaps change your oil and filter at the same time.
And if you want some suggestions for synthetic oils to use in your old car, then some options are Castrol synthetic motor oil, Pennzoil 55004233-6PK Platinum Euro L Full Synthetic Silver 5W-30 Motor Oil Lubricant, Royal Purple ROY11748HMX SAE 5W-30 High-Mileage Synthetic Motor Oil and the Polaris 2877883 OEM VES are some of the top selling types of motor oil available in the market today.
You have to make your choice based on your budget, the respective pros, cons and features of the different oils to find and start using the best suited oil for older cars.

Synthetic oil vs. Conventional oil older cars
Cars that are referred to as older cars are vehicles manufactured before 1990 or so. This means that the gaskets, seals and other parts will not be as tight as the new models. However Regular maintenance of the car engine, with a regular oil change, can go a long way in extending its strength and performance.
Failure to do so will lead to all the contaminants in the oil damaging motor parts. Regular oil changes lubricate aging parts to help save any potential premature failure. The question arises as to whether you should use synthetic or base oils in aged cars because of the mixed opinions and feedback you get for the two. So here’s a comparative article between the two worth reading.
Advantages of synthetic oils
- As mentioned earlier, it’s a common myth that synthetic oils are not safe for older cars mainly because it’s slipperier or lower in viscosity when compared to conventional. It’s also thought that this type is not compatible with seals, and can lead to leakages in places where base oil wouldn’t have triggered leaks. This is all untrue because they will in the long run, help enhance and protect old engines just as they do new cars. There was a higher chance of this occurring in the past because mostd them contained esters, organic compounds mixed with alcohol. It was this combination that was hard on seals, and lead to potential leakage.
- However there have been improvements in modern oil technology over the years and while it’s true that old car seals may not be able to handle the additives in the oils, it’s possible to make the switch if it’s done gradually and pre-planned.
- In fact, it’s better to use synthetics because they clean all the contaminants and sludge formed during the combustion process like soot, sulphuric and nitric acid and carbon generated by the motor. This leaves a clean and protected engine that boasts of a high quality performance and works much better than dirty old and new motors.
- As they take a longer time to break down they easily withstand high temperatures and flow easier in cold temperatures. This increased stability in cold temperature makes the oil best for cars in very cold winter regions or very hot summer regions.
- When it comes to this type of oil, 80% is usually the oil’s base oil while the remaining 20% constitute additives. The synthetic base oil has chemically engineered molecules with uniform properties. This leads to cleaner oil.
- Regular use of modern oils in older engines leads to cleaner pistons, improved fuel economy and horsepower protection, extreme temperature performance and optimal wear protection.
Disadvantages
- As synthetics are thinner than conventional motor oil, the engine may bleed if there’s a leak. There is also the chance of them leaving leaks while cleaning out debris, which in turn leads to the car burning oil. The solution here would be to look around and to use higher viscosity oil. You will also have to monitor oil levels and replace it as required otherwise parts may get damaged.
- Synthetic oil being expensive is another disadvantage. However not many realize that they actually end up saving money in the long run. They work and last for a longer time in engines, which means you require fewer oil changes. However just because it’s long-lasting doesn’t mean you can be careless when you change your oil. You need to maintain a regular schedule for changing oils.
For Those who like Conventional Oils
Advantages of conventional oils
- One of the main reasons to still use base oils in older cars is that it’s a more cost-effective option. Most synthetic oils cost twice as much as conventional, even amongst the same brand. This is why some people don’t consider it’s worth using such expensive oil in cars that don’t particularly require it.
- Modern oils in old cars that have run more than 75,000 miles tend to flow much more smoothly than conventional types, which can lead to a greater chance of grinding gears in the engines. This is why many manufacturers recommend using base oil because they offer better lubrication for the old motors. This leads to your car lasting for a longer period, much longer before it’s meant to go.
Disadvantages of conventional oils
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- However base oil molecules differ in shape and impurity levels. They also tend to break down quickly which is why this type cannot perform well in extreme temperatures nor flow easily in cold temperatures.
- Conventional oils are not advisable if you have to make frequent short trips because the oil may not get hot enough to burn any moisture and impurities found in the oil. This in turn leads to base oils breaking down at a quicker pace.
What should we know before switching conventional oil to synthetic motor oil?
Synthetic oil is lab-created oil with a base for lubrication of engine parts, performance additives and carrier oil for additive suspension within the mix. The additives come in powder form. It is however more advantageous to its molecular stability with changes in temperature and prolonged maintenance that it provides in the oil-change intervals.
Owing to its advantages, vehicle owners prefer switching their conventional oil to synthetic oils for better performance and maintenance. However, before switching from conventional oil to synthetic motor oil we have to clear some myths and have a clear understanding of why and how the switch should be done.
Is it safe to switch from conventional to synthetic motor oil?
Yes, it is very safe to make the switch to synthetic motor oil from conventional oil.
Can switching to synthetic oil cause leaks?
It is the most common myth that synthetic oil may wear the seals protecting the engine and result in leaks, which is not true. However this myth arose because of the manufacture of synthetic oils. Synthetics are created from esters that can be tough on seals.
Neoprene an ester, is specifically hard on seals. They would shrink the seal. But the current manufacture of synthetic oils is delicate on these engine seals. Synthetic oil will not leak, but if there are any leaks it will help you find one.
These oils clean engine deposits. If there is a cracked seal, its streamlined structure flows through the crack. These oils clean the sludge deposit on the seal and reveal the cracks within a seal. Thus, the cracks are revealed.
When should I change my car to synthetic oil?
The ideal time to switch your new car to synthetic oil is post the preliminary oil change. Lubrication is very good with synthetic oils and so the new engine doesn’t break-in. Synthetic oils are very slippery and so the wear factor is minimal.
The initial oil fill will help a little wear and tear of the new ring, after which the ring-wear is sufficient for the engine to break in. This is when the switch to synthetic oil has to be done to get the maximum advantage of the oil change.
When should the switch from conventional to synthetic oil be done?
The oil change intervals differ from one manufacturer to another. Even though the manufacturer of the vehicle recommends the oil change there’s a rule of thumb that is followed for the switch. Conventional motor oil should be changed every 3k-5k miles. For a synthetic oil change an interval of 7,500 miles is recommended in between.
A longer interval is considered for the change as synthetic oils tend to have lesser impurities and best on the engine compared to conventional motor oil. Therefore, synthetic oil can go longer than conventional oils.
If you wish to switch your vehicle from conventional oil to synthetic oil it is best to do after the preliminary oil fill. When you change your oil for the first time this is the best time to make the switch, as mentioned above.
Is synthetic oil better than conventional?
We know that synthetic oils are man-made. The primary difference between conventional and synthetic motor oil is their molecular structure and a stable framework. Conventional oils have natural elements that tend to stay inconsistent with changes in temperature. Synthetic oils give stable and good shields to your engine.
When compared to conventional motor oils, synthetic oils are better and more performance-oriented in the vehicle. The viscosity index of synthetic oils is high. The oil offers great resistance to weather changes. This implies that neither heat nor cold environment impacts the oil very much, which gives a good capability to shield the engine
Below are listed some benefits of synthetic oils:
Technological benefits
- Molecular size is uniform resulting in lesser friction in the vehicle.
- Performance-oriented additives that enhance engine protection and engine cleaning.
- Engineering and refinement to minimize deposits.
- Lesser impurities and cleaner oil.
- Better operation in extreme weather and cold conditions.
Synthetic oil versus conventional oil advantages
- Lesser emissions.
- Better oil and fuel economy.
- Longer oil change intervals without compromise on performance.
- Enhanced protection of the engine.
- Enhanced wear protection due to lesser friction.
- Higher resistance to oil thickening and so minimized engine drag.
- Uniform oil quality and efficiency.
- All-weather engine shields.
- A faster start time of engines.
- Cleans oil deposits and sludge within the engine.
The real advantage of traditional oil versus synthetic oil
- Cost efficiency due to additional protection to the engine.
- Good gas mileage.
- Synthetic oils are six to ten times the traditional oil costs.
- Synthetic oil switch from conventional oil can clear leakage plugging by cleaning deposits on them. Clogged leaks are dangerous.
- Switching to other oils from synthetic oil is not an issue.
- Synthetic oil additives are beneficial.
Can you go back to conventional oil after using synthetic?
It’s a myth that one cannot switch back to conventional oil once you start using synthetic oil for your vehicle. This is not true and yes, you can go back to conventional oil use. Synthetic oils are a blend of conventional and synthetic components.
There is nothing special to do when switching from synthetic back to conventional oil. This is because the oil blends well with conventional oil of the same weight without any engine flush. They are compatible and not so harmful to the engine or the vehicle in any way.
How do I change from conventional to synthetic oil?
If you are doing the switch for the first time, then there are two ways:
- Get synthetic oil. Dust the drain pan off and pour the synthetic oil in. This will not result in any issues.
- An engine flush can be done before the change. It is not mandatory. The benefit is that it eliminates the debris and sludge that is accumulated within before the oil change. The rate of build-up will reduce.
Conclusion on what synthetic oil is better for older cars
There is no steadfast rule about which is better oil for your old automotive. It all depends on your car, its usage, where you live and the environmental conditions. While synthetic oils were once difficult to access, you can easily buy both types online today.
Switching to Synthetic oil from Conventional oil is the right choice owing to the benefits that the switch offers, as mentioned above. The switch can be done either directly or after an engine flush. The switch is worth it and involves no harm to the engine or the vehicle.
To be on the safer side it’s always better to make the switch after talking to your professional technician and to make a gradual switch. This protects your car and ensures it performs for a longer time.

After a Little More Info on Our Picks?
Valvoline High Mileage with MaxLife Technology SAE 5W-20 Synthetic Blend Motor Oil 5 QT
- MAXLIFE TECHNOLOGY PREVENTS engine breakdown with 40% better wear protection than the industry standard
- REFRESH AGING SEALS AND PREVENT LEAKS with seal conditioners
Pros
- It comes with additives that condition the seals of your engine, rejuvenating it and preventing leakages.
- This oil is also resistant to oxidation which prevents it from breaking down.
- Valvoline HM synthetic oil also prevents the formation of deposits and clogging debris in your motor. This helps to keep your car clean and offering maximal performance.
- The HM oil does not break down in high temperatures, and it also lubricates your engine when it is cold.
- It also comes with extra detergents that make your old motor cleaner.
- Valvoline HM oil also comes with properties that enhance protection against wear which extends the lifespan of your engine.
Cons
- It is pricey.
- You may have difficulties pouring the oil into your engine.
- You may also have difficulties estimating the amount of oil you have poured into it.
What we like
Valvoline HM oil comes in-an-easy to pour bottles. The bottle contains a precision pour spout that ensures that the oil pours into the engine and there will be no spillage. Also, it features an anti-glug tube and easy pull-tab so that you will not have challenges in opening it.
As your it grows older, it becomes weaker. It, therefore, requires better lubrication to extend its life. Valvoline HM synthetic oil is thick, and it provides an additional anti-wear film which will have better protection against wear which prevents breakdown.
Valvoline oil is formulated to meet the needs of high mileage motors. It is a combination of synthetic oil and conventional base stocks and other additives. For instance, it features seal condition agents. The agents enable the oil to condition the seals of your old engine to prevent leakages.
Additionally, it features extra cleaning agents and is more prone to wear and tear, which may lead to more deposits and sludge in your motor, which may cause to breakdown. With the cleaning agents, Valvoline HM oil clears all the deposits, enhancing performance and durability.
The grinding of an old engine generates a lot of heat which leads to the fast disintegration of conventional motor oil. On the other hand, you have Valvoline HM oil that resists breaking down even at elevated temperatures and enjoys optimal protection, even when it is hot.
Also, these temperatures lead to oxidation of oil which may lead to acid formation and corrosion of parts. However, Valvoline HM oil is oxidation resistance which provides more protection. It also increases the oil drain interval, which leads to a better fuel economy.
Its novel friction modifiers also provide more protection guaranteeing a longer life for your motor.
This oil allows easy start-up of your engine in the morning and when it is cold. It also offers faster and better lubrication and smooth shifting of gears.
What we do not like
Some users complain that it is a challenge trying to estimate the amount of oil that you have put in the engine. The markings on the container are not visible.
Royal Purple ROY11748 HMX SAE 5W-30 High-Mileage Synthetic Motor Oil – 5 qt.
- Specifically Designed To Minimize Wear And Restore Lost Performance In Engines With More Than 75,000 Miles
- Formulated With Robust Zinc/Phosphorus Anti-Wear Compounds Combined With Royal Purple'S Proprietary Additive Technology
Pros
- It extends oil drain intervals.
- The oil has an ionic attraction to metal surfaces which reduces wear during startup and guarantees better protection.
- Royal Purple ROY11748 also reduces metal-to-metal contact and friction which allows your engine to have the best performance.
- It revitalizes the seals which prevent oil leaks.
- It reduces the oil consumption.
- If your motor has performed for over 75,000 miles, Royal Purple ROY 11748 is the oil for you, It restores the optimal performance and also minimizes wear.
- The oil also features a proprietary additive technology and robust zinc and phosphorus compounds. These provide more protection against wear and extend the life of your engine.
- HMX is also oxidation-resistant which extends the oil drain intervals.
Cons
- Some customers do not notice any change in power by using the oil.
What we like
Without proper lubrication, older automotives experience a lot of wear during startup. HMX features molecular ionic attraction to metals maintaining a film of oil on the metals.
Due to increased use, high mileage engines also have more deposits and debris. The dirt and deposits may adversely affect the performance of your motor and its lifespan. HMX comes with cleaning properties that collect and eliminate all the deposits leading to a cleaner and healthier engine.
Increased temperature in it leads to oxidation of oil and affects its viscosity. HMX offers you outstanding resistance against oxidation which extends the intervals of oil drain. Thus, you enjoy better fuel economy and more protection.
It also comes with detergents as additives that enhance the cleanliness of the motor. The detergents clean all the deposits in the engine, is corrosion-free and lasts longer.
Also, this brand of oil comes with zinc/phosphorus additives that also combine with proprietary additives to offer maximum film strength. This reduces wear and tear and prolongs its lifespan.
Royal Purple HMX also does not break down in extreme temperatures which protects your motor even when it is hot.
If your vehicle has seen you through 75,000 miles and more, Royal Purple HMX is what you need to revitalize and restore its performance.
What we do not like
Some customers say that there is no noticeable change in power when they use Royal Purple HMX.
It is more expensive though the cost is worth it.
Castrol 03100 GTX High Mileage 5W-20 Synthetic Blend Motor Oil, 5 Quart
- Phosphorus Replacement Technology to help extend the life of the emission system
- Superior dispersancy that fights sludge build up
Pros
- Castrol 03100 GTX features superior detergents that clean and prevent the build-up of deposits.
- It also features oil conditioners that revitalize the seals to prevent leaks.
- It also comes with additives that offer enhanced protection against wear prolonging the lifespan of the engine.
- Castrol 03100 GTX also provides resistance against oxidation which prevents the formation of acid that would cause corrosion.
- The synthetic oil offers you smooth startups in the morning and enhanced protection when the temperatures are high.
- Additionally, it does not disintegrate under high temperatures which extend the oil drain intervals.
- Castrol 03100 GTX is specially formulated to offer better protection for your old motor and also restore its performance.
Cons
- They recommend a 3000 miles oil change which is far less compared to others.
- Other users do not notice any considerable variation in the performance of their vehicles.
What we like
We like that synthetic oil is resistant to oxidation. If there is oil oxidation, it leads to the formation of acids that causes corrosion of internal parts. Castrol 03100 GTX, therefore, prevents corrosion, making your pride and joy last longer.
Additionally, old motors are prone to more wear and tear, which leads to more build-up and deposit formation. Castrol 03100 GTX comes with superior detergents that get rid of all the deposits.
One reason that makes drivers apprehensive of using synthetic oil on their cars is that it is slipperier than base oils. As such, it may not be compatible with the seals of the old engine leading to oil leaks.
Well, Castrol 031000 GTX comes with additives that rejuvenate the old seals and makes them compatible, which reduces leakages.
Higher mileage engines require more push to perform maximally. Thus, they generate more heat which breaks down conventional oils within a short time. This reduces the protection of your motor and minimizes oil drain intervals.
With the use of Castrol 3100 GTX you are assured of optimal performance and protection even when the motor heats up. The oil features thermal properties that offer optimal performance and protection in high temperatures.
Unlike conventional motor oil that may have a problem lubricating the car during start-up, Castrol GTX provides a smooth startup and running even in cold weather.
It also features excellent dispersants, which helps to prevent the build-up. Additionally, it comes with detergent additives that help to collect and eliminate all deposits.
What’s more? It also features Phosphorus Replacement Technology that helps in extending the life of your transmission system.
When you use Castro 03100 GTX on your vehicle, you will enjoy better fuel economy, more protection, and better performance.
What we do not like
For some users, there is no change in the performance of their vehicles when they use it. MSDS that the oil is 75% highly refined crude oil despite it being advertised as full synthetic oil. Other users complain that it does not perform optimally when the engine heats up.
Lucas Oil 10679 10W-30 Petroleum Oil – 5 Quart Jug
- Lowers oil temperature
- Minimizes metal fatigue
Pros
- Provides protection even under severe conditions.
- It comes with a ton of additives that enhance its protection and performance properties.
- It slows oil burning.
- Lucas 10679 oil also improves the pressure in high mileage engines.
- The oil also comes with features that help it to perform under extreme temperatures.
- The oil is compatible with methanol, synthetic and base oils, and racing fuels.
- Lucas 10679 oil improves the film strength between the piston rings and cylinder wall.
- It is thicker and tougher, which provides more protection against wear. It also lowers oil temperatures extending its life.
- Additionally, the oil will provide protection even when working under severe conditions.
Cons
- Users complain that its performance reduces when the engine heats up.
- It can be more expensive than its conventional counterparts.
What we like
When looking for synthetic oil to use for your high mileage motor, you want one that can perform in extreme temperatures and will have optimal protection and performance, whether it is cold or hot.
Therefore, you will enjoy smooth start-ups, even when the vehicle has been idle for some time. Lucas 10679 comes with thermal properties that guarantee you maximum protection even when it heats up. It also allows you to have a smooth start-up and lubrication in cold temperatures.
Do you want an oil that you can use with other oils without issues? Well, your search ends when you get Lucas 10679. The oil is compatible with methanol, conventional and other synthetics.
However, to achieve maximum performance and protection, it is recommended that you should drain your current oil before adding Lucas 10679.
Lucas 10679 is formulated using paraffinic base oil and it features a ton of other additives to enhance its performance. For instance, it comes with zinc, phosphorus, and molybdenum additives that make it tougher and thicker. As such, it offers maximum protection against wear even when working under severe conditions.
It also lowers the temperatures of the oil as the motor operates. Thus, it minimizes metal fatigue extending the lifespan of your high mile engines.
Additionally, it also improves the film strength between the piston rings and the cylinder wall, reducing friction and wear.
What’s more? Lucas 10679 synthetic also improves pressure in your car and also slows down the burning of oil. Thus, you will have less oil draining intervals which saves you a lot of costs.
It also features cleaning additives that collect and eliminate deposits and dirt from your automotive. This reduces friction and enhances the performance of your motor.
What we do not like
It may cause the vehicle to smoke a little out of the exhaust. The synthetic oil is also more expensive compared to base oils Some users complain that it does not perform well in high temperatures
Quaker State Advanced Durability Conventional 5W-30 Motor Oil (5-Quart, Single-Pack)
- Synthetic blend 5W-30 engine oil that provides durable wear protection and reduces engine wear
- Provides corrosion protection against harmful acids generated by engine contaminants
Pros
- Quaker State contains additives that neutralize acids preventing corrosion of metal parts.
- The oil meets and exceeds the warranty requirements of most car manufacturers in North America.
- It retains its viscosity throughout the drain period which ensures lubrication and advanced protection.
- With Quaker State, you will enjoy better fuel economy.
- The oil meets the requirements of the GF-5 standard.
- It is also ready to provide protection and optimal performance under harsh conditions.
- You will enjoy a longer life if you use Quaker State oil.
- It is ideal for use in all hardworking vehicles including minivans, SUVs, among others.
- Seals compatible to prevent leaks.
Cons
- Pricey.
- Users complain of damaged packages and oil spillage.
What we like
The advanced durability oil meets the GF-5 industry standards for the fuel economy requirements. If you want an oil to use for highway operations at high speed and stop-and-go type of operation, Quaker State is the fuel for you. It comes with features that offer advanced protection against wear which helps your old motor to survive daily operations even in harsh conditions.
As the old girl operates, it releases contaminants from its wear and tear. The contaminants may lead to the formation of acids which may cause corrosion of the metal parts. Quaker State Advanced Durability conventional motor oil provides protection against acids which may cause corrosion and expands its lifespan.
It also maintains the viscosity all through the drain period. As such, your motor will have optimal protection throughout the interval drain, enhancing the durability of your engine.
For some oils, they have a challenge performing under harsh conditions. For instance, you would want an oil that will stand the excessive idling time and occasional accelerations of heavy trucks. Quaker State passes the test of providing optimum performance and protection in all engine conditions.
Has your vehicle seen over 75,000 miles? Are you lost on the best oil to use that would not leak?
Worry no more. Quaker State Advanced durability oil is designed for the high mile engines. It comes with additives and properties that condition the seals to prevent oil leaks.
The advanced durability oil also provides protection against deposits all through the drain interval. Thus, you will have a clean and healthy engine all through which guarantees you the best performance and protection. If you are looking for the ideal oil to use in hardworking cars, Quaker State Advanced Durability is the oil for you. You can use it on SUVs, minivans, crossovers, among others.
Are you worried about what would happen to your warranty once you use the oil?
Worry no more. Quaker State, Advanced Durability oil, meets the warranty requirements of many car manufacturers including a Japanese, European, and United States.
What we do not like
- Some users complained that when they ordered, the oil came with a damaged package and oil spillage in the box.
- It is expensive.

FAQ
Can I use synthetic oil in my car?
Nothing stops you from using synthetic oil in your car, whether old or new. They have a formulation to meet the needs of your car. For instance, they come with cleaning agents that help to keep your motor clean and healthy.
For old engines, synthetic oils may leak as they have a low viscosity than conventional. But they come with additives that help to rejuvenate the oil seals. As such, there will be no leakage even though you use them in an old motor.
Is it ok to use synthetic oil in older cars?
Older cars need more lubrication to reduce internal components being worn. They also need more cooling and cleaning to guarantee a longer lifespan.
Base oils do not come with any additives. As such, they do not enhance cleaning, cooling, or prevent friction.
Additionally, older cars generate a lot of heat. Conventional motor oil dissipate under high temperatures, this leaves your engine exposed to wear and tear.
But, synthetics are man made with specific additives that help your old motor. For example, they come with properties that rejuvenate the seals in the old engine. This prevents any leakages.
Additionally, it comes with cleaning agents. They collect all the deposits and enjoy a cleaner motor that guarantees better performance.
Plus, the thermal properties help to withstand the high temperatures and the synthetic oil offers better protection than base.
The enhanced protection ensures you have fewer trips to the maintenance shop and they also reduce the emissions from the engine.
What is the best synthetic oil for high mileage engines?
Mobil 1 high mileage stands out as the best brand for these motors, as it provides better lubrication.
Mobil 1 is also resistant to break down in elevated temperatures and offers optimal protection when it heats up to operating temperature.
These engines have seals that break down with time. This may lead to oil leakage. Mobil 1 features seal conditioners. The conditioners rejuvenate the seals and prevent their breakage giving a high performance motor with no leakages.
Additionally, Valvoline also comes with cleaning properties.
What oil is best for old engines?
Valvoline MaxLife 10W-40 stands out as the best oil for old motors. Valvoline comes with enhanced additives. The additives enable your motor to perform better.
It comes with seal conditioners that prevent leaks. It also comes with cleaning properties. These help to remove deposits and prevent the formation of sludge. Thus, you enjoy a clean and healthy engine with better performance.
It is also resistant to breakdown in high temperatures. It prevents oxidation and rust formation, and so on.
Are synthetic oils ideal for old vehicles?
Synthetics provide optimal performance and protection in old engines just as they do for new ones. Most people are apprehensive of using this type in high mileage vehicles because they are slippery. Thus, they think that they will allow friction of internal parts.
However, apart from having the appropriate viscosity, they also come with other additives. Therefore, they protect against wear and tear better than conventional types would.
Also, there is the general fear that synthetic oils will leak when used on these motors because of their viscosity. On the contrary, they come with seal activation agents that revitalize the seals preventing leaks.
Does using synthetic oils affect the warranty of my high mileage engine?
No, it does not. Most of them meet the requirements of the various motor vehicle manufacturers worldwide. As such, they will not affect the warranty of your vehicle in case of any eventuality.
Do synthetic oils break down fast while used in old cars than in new cars?
No, they do not. They are artificially made while conventional motor oil comes from the purification of crude oil.
Being artificial, synthetic types are made with specific additives that help to meet the various needs of the older engines.
For example, high performance motors are more prone to wear, which leads to the release of deposits and sludge. The dirt may adversely affect the performance of the engine.
They come with properties that enable them to collect and clean all the deposits in the old engine. Thus, you will have a cleaner and healthier engine guaranteeing better performance.
They also come with thermal properties that enable your car to have a smooth start-up when it is cold. They also provide better protection and performance in elevated temperatures.
Are synthetic oils compatible with other types of oils used in old vehicles?
Most of them are compatible with other synthetic oils and with conventional types. That means you do not have to drain the oil to add your new oil. However, to achieve the best performance, it is recommended that you should use your new bottle alone.
It is more durable than conventional oil. It is more resistant to oxidation, and it does not break down in elevated temperatures. Therefore, using this type on your vehicle guarantees, you extended oil drain intervals. Thus, you will enjoy more fuel economy.
How do synthetic oils provide acid corrosion protection in high mileage vehicles?
The deposits from the wear lead to the formation of acids that may cause the corrosion of metal parts. If you use base oils on your vehicle, they may not deal with this problem.
On the other hand, synthetics come with additives that protect the formation of deposits. They also contain agents that clean all the contaminants in the engine, preventing the formation of acids. You will, therefore, have a cleaner, healthier, and more protected engine with a better performance.
Last update on 2023-10-02 / Affiliate links / Images from Amazon Product Advertising API