10 Best High Mileage Synthetic Oils (for Cars and Trucks)

The type of engine in your vehicle has a lot to do with its performance and fuel economy. However, the type of oil you use to lubricate the components of a high mileage engine (75,000 miles or more) will directly correlate with the amount of additional miles of problem free usage.

If your car or truck is classified as having a high mileage engine, then you will want to use a synthetic oil that is specifically formulated for high mileage use.

Many oils are formulated for this purpose, but certain types of synthetic oils will better protect your engine than others. You just need to know which synthetic oils on the market are the best.

Top 10 Best High Mileage Synthetic Oils

Below are the top 10 best high mileage synthetic oils for cars, trucks, and SUVs.

1) Pennzoil Platinum High Mileage Full Synthetic Motor Oil

Pennzoil Platinum is a highly recommended motor oil by most auto experts in the industry. The “high mileage” varation of their popular oil is specially formulated for vehicles over 75,000 miles. Although the oil is 100% synthetic, it is derived from natural gas.

The PurePlus technology of Pennzoil Platinum can actually turn a gas into a liquid. In this case, it converts natural gas into a base oil. This is a much cleaner oil because it doesn’t contain the impurities and contaminants like you’d find in crude oil.

To enhance the performance of this synthetic oil, there are special additives put in it which work extra hard to protect your engine.

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This is one of the best synthetic oils for dry or cracked seals found in many high mileage cars and trucks. It actually conditions seals to reduce leaks and oil burn-off. Your pistons will be 50% cleaner when introduced to this oil. In fact, your entire engine will be cleaner in comparison to most other synthetic oils on the market. One of the best things about Pennzoil Platinum High Mileage is that it is formulated to protect your engine and keep it running for as long as possible.

You should be able to get at least 5,000 miles of driving time on this oil and many vehicle can go as far as 10,000 miles before the next oil change. It depends on which type of vehicle you have as well as your driving conditions.

Another important thing worth mentioning is how well Pennzoil Platinum performs under extreme temperature conditions. This not only includes extremely hot temperatures, but also extremely cold temperatures. If you live in a region where you experience the common weather elements of each season, then you will want to use this versatile engine oil to accommodate your summers and winters.


You get what you pay for. Since this is premium grade motor oil, it is also a more expensive motor oil. This is perhaps one of the only reasons why someone might not choose this oil. However, you should not be cheap when it comes to your motor oil.

After all, how often do you change your oil in the first place? You might do so every 6 months or more, depending on how often you drive. It may be worth spending a little more money each time just to get the best oil possible. That way, you can preserve your engine’s lifespan and not have to worry about purchasing an entirely new vehicle in the near future.


It should be clear that Pennzoil Platinum is a great motor oil in every way. If you care about your engine performance and longevity, then you should want to get this oil for it. The only thing that might deter you is the price.

But hey, even platinum motor oil like this isn’t going to break the bank. For just a few dollars more than some others, is that really a lot to spend every 6 months if it means preserving your engine? You be the judge.

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2) Castrol EDGE High Mileage Full Synthetic Motor Oil

If you are familiar with oil brands, then you have probably heard of Castrol before. They are a widely recognized company which has developed a worldwide reputation for their high-performance synthetic oils. Most vehicle owners with high mileage engines will find Castrol EDGE High Mileage to be a safe oil to use.

It is 100% synthetic and contains a unique titanium technology that causes the oil to change its behavior whenever it is put under high-pressure situations. Basically, the titanium technology causes the film power of the oil to double, resulting in the friction of the engine components to be reduced.

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3) Valvoline Full Synthetic High Mileage Motor Oil

Valvoline full synthetic high mileage motor oil with MaxLife technology is 100% synthetic and works great in the average car engine. It is formulated to clean your engine thoroughly and to protect it under high temperatures.

Most importantly, the conditioners, detergents, and thicker anti-wear film in this oil will better protect your high mileage engine as it gets older and you continue to drive it.

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4) Royal Purple HMX High Mileage Synthetic Motor Oil

Royal Purple has a huge following among auto enthusiasts and is a brand that is known for both their oil filters and synthetic oils. Most auto professionals agree that Royal Purple Synthetic Motor Oil is the best. This high mileage version is formulated specifically to minimize wear and restore lost performance in older engines. Its additional detergents remove carbon deposits and buildup while the conditioners revitalize dry, hardened seals.

Royal Purple might not advertise themselves as much as their competition but instead rely on word of mouth. Not cheap but so worth it.

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5) Shell Rotella T6  Full Synthetic Diesel Engine Oil

If you have a diesel engine in your high mileage vehicle, then you should consider Shell Rotella T6 Diesel Synthetic Motor Oil. It offers a technology called “Triple Protection Plus” which works thoroughly to prevent oil deterioration, overheating, wear and tear, and deposit accumulation. Your engine performance and fuel mileage can actually improve as you continue to use this oil in it.

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See also: Symptoms of: Clogged, Leak and Wrong Oil Filter in Your Car

6) Mag 1 Full Synthetic Motor Oil

Mag 1 Full Synthetic Motor Oil is one of the top viscosity grade oils which is shown to reduce engine wear and increase fuel efficiency in high mileage engines. This specific synthetic oil is one of the best at protecting against cold star wear. It is suitable for most sized engines of passenger cars and trucks throughout North America and around the world.

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7) Mobil Super Synthetic Motor Oil

Mobil Super 5W-30 Synthetic Motor Oil is an affordable synthetic oil which gives you a lot of great benefits. Made for vehicles of all ages and miles, you will be able to get up to 7,500 miles on this oil before it needs changing. In the meantime, your engine will stay protected from debris and overheating. This oil is compatible with all oil filters, so you will have no problems there.

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8) Liqui Moly Premium Synthetic Motor Oil

Liqui Moly Premium Synthetic Motor Oil is made in Germany and popular with many German cars. Your high mileage engine will be protected from the common wear and tear that occurs during its use.

This oil has some of the best lubricating properties around and it doesn’t matter if you have 25,000 or 250,000 miles on your vehicle. Known more for their excellent engine additives, Liqui Moly also produces and excellent engine oil.

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9) Mobil 1 Extended Performance Full Synthetic Motor Oil

Mobil 1 Extended Performance synthetic oil is guaranteed to provide up to 15,000 miles of protection. This is a great mileage range that surpasses most of its competition but you should still follow your vehicle’s recommended oil change interval.

Many have reported minor oil leaks stopping after switching to this oil so we know it does a great job conditioning old seals. A good premium oil that many compare to Royal Purple.

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10) Schaeffer Supreme 9003D-012S Full Synthetic Engine Oil

A true premium oil, Schaeffer Supreme does an excellent job of improving engine durability and fuel economy, even in high mileage vehicles. This oil will not thicken under the coldest temperatures and it will keep the engine cool under hot temperatures.

It will also prevent sludge buildup and it will keep your engine as clean as possible. While it may be more expensive than others, auto enthusiasts agree it’s one of the best.

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