The 5 Best High Mileage Oils of 2021

Jerry Wilson
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Today’s motor oils are formulated for modern engines and cleanliness is a very important factor in their performance. New tests are implemented to high mileage oils to ensure that they are able to deliver superior performance.

These tests are:

{1}. Oxidation Test – This test measures the resistance of the oil to oxidation. Oils that pass this test are suitable for use in modern turbocharged engines.
{2}. Thermal Stability Test – This test determines the resistance of the oil to thermal breakdown at high temperature.
{3}. Antioxidant Package Test – This test measures the ability of the oil to protect against viscosity breakdown and it takes into consideration the effect of higher temperatures, which promotes antioxidant breakdown.

The following high mileage oils are highly recommended because they offer enhanced protection at high temperatures to ensure better operating performance and extended engine life.

NameCategoryProduct
Royal Purple 11744 HMX SAE 5W-30 High-Mileage Synthetic Motor OilBest OverallRoyal Purple 11744 HMX SAE 5W-30 High-Mileage Synthetic Motor Oil
Valvoline High MileageBudget PickValvoline High Mileage
Castrol 06470 GTX High Mileage 20W-50 Synthetic Blend Motor OilUpgrade PickCastrol 06470 GTX High Mileage 20W-50 Synthetic Blend Motor Oil

1. Royal Purple 11744 HMX SAE 5W-30 High-Mileage Synthetic Motor Oil

Our rating: 10 / 10

Royal Purple 11744 HMX SAE 5W-30 High-Mileage Synthetic Motor Oil

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Pros:

  • Proven under the TOUGHEST driving conditions and used by some of the most demanding drivers on the planet, the patented additives used in this oil have no equal in motor oil history.
  • The oil provides exceptional protection at extreme temperatures, thus increasing the efficiency, performance, and longevity of the engine.
  • Noted as the best oil for diesel engines that undergo extreme usage.

Cons:

  • The oil is one of the most expensive in the market but is well worth the unbelievable level of protection it offers.
  • The oil is not suitable for vehicles that run on synthetic oil already.

2. Castrol 06470 GTX High Mileage 20W-50 Synthetic Blend Motor Oil

Our rating: 9 / 10

Castrol 06470 GTX High Mileage 20W-50 Synthetic Blend Motor Oil

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Pros:

  • Great multiuse protection for different types of climates
  • Lasts for 15,000 miles or 12 months

Cons:

  • Heavy in weight
  • Not recommended for classic sports car engines

(Packaging May Vary)

Castrol GTX High-Mileage is a racing engine oil that can be used in heavy-duty cars, sports cars, and in high mileage vehicles that need to be driven in tough conditions.

Castrol GTX High-Mileage is trusted by Maserati, Mercedes, Ferrari, and BMW to protect and enhance engine life.

3. AmazonBasics High Mileage Motor Oil

Our rating: 9 / 10

AmazonBasics High Mileage Motor Oil

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Pros:

  • Affordable
  • Enhanced protection against sludge and varnish

Cons:

  • Inadequate viscosity
  • Contains additives that do not comply with some regular motor oil specifications.

This product is one of the best high mileage oils out there. We also love how it is synthetic, yet affordable.

The viscosity options offered by the product range between 5W-30, 5W-20, 10W-30, 10W-40. Each of these variants is blended using many quality base oil along with reliable additives, which, in turn, provides higher engine protection.

Above all, the manufacturer provides an efficient warranty of when it comes to the performance of the oil.

4. Valvoline High Mileage

Our rating: 8 / 10

Valvoline High Mileage

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Pros:

  • Uses synthetic technology to replenish lost performance due to wear and heat
  • Works in extreme weather conditions
  • Extends the life of an engine and can increase fuel efficiency
  • Compliant with API SN, SH, CF, ACEA A3/B3 oils specifications
  • Includes Maxlife Technology additive technology
  • Contains friction modifiers that improve performance and extends oil change intervals
  • Meets OEM requirements for top tier vehicles
  • Compatible with traditional and advanced diesel engines
  • Safe for use with all 1996 and newer vehicles

Valvoline’s High Mileage Oil comes equipped with high-performance MaxLife technology additive to maximize oil life and maintain an engine’s peak performance. The MaxLife additive rejuvenates lost performance due to oil breakdown and heat and replenishes lost or worn out additives. Advertised as being good for 15,000 miles of service or one year of regular use, depending on the vehicle type. Valvoline’s High Mileage Oil reduces engine wear down to a minimum, allowing for engines to run cooler and more efficiently and reduces engine power loss due to oil breakdown.

5. Mobil 1 45000 5W-30 High Mileage Motor Oil

Our rating: 7 / 10

Mobil 1 45000 5W-30 High Mileage Motor Oil

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Pros:

  • Great packaging
  • Outstanding quality
  • Best for high mileage cars

(Pack of 4)

The Mobil 1 45000 High Mileage Engine Oil, also called High Mileage Engine Oil, is way better than any mineral engine oils. It is designed to give the longest protection. This engine oil contains a proprietary blend of viscosities to achieve higher viscosity at low temperatures.

It gives your car an extra protection from wear and tear along with reducing any harmful deposits which are formed inside your engine that cause damage in the long term.

Frequently Asked Questions (FAQ)

What is the best high mileage oil?

The best high mileage oil varies for every type of engine. Warming up and getting your engine to run smoothly and efficiently requires the right oils for your variety of engine. Therefore, we created comprehensive information based off of the best oil for your specific engine.

We broken down each group into several variables, so you can get the best oil for your needs without a lot of work. Below, you’ll find a chart that shows the best high mileage oil for your vehicle’s engine.

If you're a stick-shift driver, use this chart to find out which one is best for your car.

If you're a automatic driver, use this chart to find out which one is best for your car.

Is it better to use thicker oil in high mileage engine?

The best thing to do here is to follow your owner's manual. If you don't have it, then go to the car manufacturer's website (see the "links" section below for a couple of them). The manufacturer's have done the testing and will give you the recommendation with reasons.

The key thing you need to know is that thicker oil will be protected from heat for a few more degrees before it starts to thin out, so if your vehicle calls for 5W30, then 5W20 or even 10W30 can be safer options. What this means is that thicker oil protects your engine longer under high heat conditions.

This is especially important in the summer, of course. Thicker oil also protects from cold temperatures. So if you live in a cold climate, and will be starting your car in cold temps, using thicker oil can be helpful.

Does high mileage oil really work?

As you likely already know, most car oils are advertised as being good up to a certain mileage. This is important because if your car acts up, or the oil needs to be changed, you don't have to pay for the entire job. It’s nice to know that you won't overspend, and it’s reassuring to know that you won't have to start panicking about your car right away.

This is why we keep chainsaw or weed trimmer oil around, that we only use when we need to. We’ve seen how they work, for years now, but never got around to putting them to the test. In our most recent review test, we decided to throw these old articles into our oil test arena to see what would happen.

Is 5w30 good for high mileage?

These best high mileage Oils vary depending on your car, engine, and driving conditions. The answer to this question is ultimately determined by the car manufacturer, or the engine manufacturer, and the conditions you typically drive in. They typically recommend a higher weight oil for longer life in larger engines and more extreme driving conditions. The best advice we can give you is to follow your owner’s manual and try an oil with a weight similar to what it recommends. In general, the weight is determined by the thickness of the oil at low temperatures. The lower the thickness, the thinner and lighter the oil. The higher the thickness, the slower it flows at low temperatures.

So what should you do to find the best High Mileage Oil for your car?

Ask your local mechanic about the best oil and weight for your specific driving conditions. You can also call the toll free number on the back of the oil and ask them what weight you should use.

Conclusion

If you find yourself with a vehicle that has over 100,000 miles, here are 5 of our favorite high mileage oils on the market today for your looking. Each oil in the list is listed in order from the one most expensive to the cheapest.

Our Recommendation

NameCategoryProduct
Royal Purple 11744 HMX SAE 5W-30 High-Mileage Synthetic Motor OilBest OverallRoyal Purple 11744 HMX SAE 5W-30 High-Mileage Synthetic Motor Oil
Valvoline High MileageBudget PickValvoline High Mileage
Castrol 06470 GTX High Mileage 20W-50 Synthetic Blend Motor OilUpgrade PickCastrol 06470 GTX High Mileage 20W-50 Synthetic Blend Motor Oil