Best Oil For Cars With Over 100k Miles (Detailed Reviews)

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When you drive a car up to 100,000 miles, most of its components would be weak and need replacement. However, with regular maintenance, such a car can last longer, up to 200K miles or longer. One of the ways to keep an old car’s engine running at its best is to use the right motor oil specified for the engine.

A vehicle with over 100k miles is considered a high-mileage car, and as such, it is best to use high-mileage engine oils for such a car, which is why we’re about to show you some of the best oil for cars with over 100k miles.

High mileage motor oils are specially formulated to protect old engines against wear by coating the internal parts with a film. They are also typically made with seal conditioners to prevent leaks.

The truth is, for vehicles with over 100k miles, it is best to use high mileage motor oils. Regardless, most “regular” (non-high-mileage) full synthetic motor oils are suitable for engines with over 100k miles.

Types Of Motor Oils (By Mileage)

Best Oil For Cars With Over 100k Miles

There are two major types of motor oils: high mileage oils and regular oils. Both types of oil can come as full synthetic, synthetic blend, or conventional oils.

High Mileage Motor Oils

This type of motor oil is mainly specified for old engines (I.e., engines that have lasted for many years), or high mileage engines (engines that have gone past 75K miles).

It is not advisable to use this type of motor oil on newer vehicles, regardless of whether the one you’ve got is full synthetic or synthetic blend; high mileage engine oils are most suitable for old engines.

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Regular Motor Oils

Regular motor oils simply refer to engine oils that are not clearly indicated as “high mileage” oils.

This type of oil is suitable for all kinds of engines (both new and old) – you just have to choose the one that matches the specifications and viscosity grade for your engine (ex. 5w20, 0w30, 10w40, and other grades).

You can actually use regular motor oils on cars with over 100k miles – but that has to be full synthetic models. An engine with 100k miles would potentially have worn-out parts that need strong additives (which are typically included found in full synthetic oils) to prevent further wear and leaks.

Best Oil For Cars With Over 100k Miles

1. Royal Purple High Performance Synthetic Motor Oil

Royal Purple 51130 API-Licensed SAE 10W-30 High Performance Synthetic Motor Oil - 5 qt., Model:ROY51130
  • Better wear protection
  • Increased fuel efficiency
  • Better protection of the expensive catalytic emission system
  • Improved compatibility with fuels containing ethanol
  • Superior corrosion protection

The Royal Purple brand is notable for producing some of the best-performing motor oils out there. This high mileage oil from the brand is made with a patented formula that is meant to unlock the best performance of high mileage engines while protecting the core internal components from excessive wear.

This is a full synthetic oil, available in different grades, and comes in a 5QT container. You can use this oil on vans, trucks, and sedans with over 100k miles.

It is also suitable for engines with over 200k miles. The formula and additives in this oil help to improve fuel efficiency, protect against wear, and the emissions system.


  • The formula includes patented anti-wear additive for optimal protection of core engine components
  • Maximizes fuel economy and horsepower
  • Improves LSPI protection


  • You can choose from the different grades available
  • Good buy for the price
  • Includes premium and patented additives in the formula


  • Some users complain that it burns off faster

2. Havoline High Mileage Synthetic Blend

HAVOLINE 5W20 High Mileage Synthetic Blend, 5 Quarts, 1 Pack (223680474)
  • Havoline High Mileage Motor Oils with Deposit Shield deliver value through:
  • Helping to prevent oil consumption
  • Exceptional wear protection
  • Exceptional wear protection

100k is “high mileage,” and as such, you need to use a high mileage engine oil for the car. Interestingly, the Havoline high mileage oil is one of the best-recommended options in the market.

This engine oil is specified for 5w20 engines; but, it is available in other viscosity grades including 0w20, 10w30, and 5w30.

So, you can choose the grade for your engine and stick with it. However, this Havoline motor is a synthetic blend (it’s a full synthetic oil), but it works well for old and high mileage engines. The formula includes premium additives targeted to improve the performance of high mileage vehicles.

Furthermore, this synthetic blend comes in a 5QT container, which is big enough for any type of vehicle; in addition, it meets the industry’s standards.


  • Meets the industry standards for all available grades
  • Exceptional protection against wear
  • The formula is advanced and patented
  • High resistance to oxidation


  • Good price
  • Reduces oil burn off in old engine
  • Cleans the internal engine parts very well
  • Improves fuel economy


  • It is not full synthetic oil

3. Mobil 1 High Mileage Motor Oil

Mobil 1 High Mileage Full Synthetic Motor Oil 10W-30, 5 Quart
  • Mobil 1 High Mileage full-synthetic motor oil 10W-30 is designed for engines with over 75,000 miles to go up to 10,000 miles between oil changes.*
  • Utilizes Mobil 1’s signature Triple Action Formula to deliver outstanding engine performance, protection, and cleanliness
  • Meets ILSAC GF-6 standards to help provide low-speed pre-ignition (LSPI) and timing chain wear protection while keeping your engine clean and helping to improve your fuel economy
  • Provides excellent internal engine heat protection (up to 500 degrees F) and low temperature protection (to -30 degrees F)
  • Mobil 1 is specially formulated to help remove sludge and lower engine temperatures

Coming from one of the best brands that manufacturer motor oils of different grades, this high mileage oil is inarguable a good choice for cars with over 100,000 miles.

This high mileage oil from Mobil 1 comes in a 5QT container, and the formula includes premium additives meant to protect and improve old engines.

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It is a full synthetic motor oil, which gives it an edge over the other options in the market. While the manufacturers allege that this oil can last for up to 12,000 miles drain intervals, it is advisable to stick with 10,000 miles drain intervals.

More so, you can use this motor for all kinds of vehicles; it cleans old engines and protects them.


  • Perfectly cleans out deposits and sludge
  • Exceptional protection against wear
  • Flows evenly in low and high temperature
  • Patented additives


  • This oil works on all European and Asian car models
  • Available in different grades
  • Advanced full synthetic oil
  • Includes seal conditioners in the formula


  • Quite expensive

4. Amsoil Small Engine Synthetic Motor Oil

Amsoil is also one of the notable brands that produce high-performing engine oils of different grades. This high mileage oil comes in a 1QT container and it is suitable for all kinds of old engines. It is a full synthetic motor oil made from pure petroleum and patented formula.

The formula works to reduce oil burn-off, protect against wear by coating the engine parts, and reduce leaks, thanks to the seal conditioners. Amsoil engine oil is one of the best in the market, and it can be used on trucks, vans, and cars. You may need to buy at least two of this oil since it’s just 1QT.


  • 100% full synthetic motor oil
  • Made with Amsoil’s advance synthetic formula
  • Fortified to prevent leaks and excessive wear


  • Good price
  • Reputable brand
  • Available in different grades
  • Good for cars and trucks


  • This model is just 1QT, you need to buy more of it

5. Valvoline Full Synthetic High Mileage Oil

Valvoline Full Synthetic High Mileage with MaxLife Technology SAE 10W-30 Motor Oil 5 QT
  • Full synthetic formula is engineered with Enhanced MaxLife Technology to prevent engine breakdown in vehicles with over 75,000 miles
  • Formulated with seal conditioners to prevent and treat oil leaks, Valvoline Full Synthetic High Mileage minimizes oil consumption and maximizes engine life
  • 50% better wear protection than the industry standard and 25% extra defense against deposits, sludge, corrosion and rust
  • Meets or exceeds all requirements of ILSAC GF-6A, API SP, API SN with SN Plus, API SN
  • American made and formulated, from the Original Motor Oil brand trusted for more than 150 years

The Valvoline Full Synthetic motor oil proves to be one of the best oils for engines with over 100k miles (or even 200k miles).

It is a full synthetic motor oil available in different grades, and the formula is carefully decided for old cars. This oil cleans the engine perfectly and contains seal conditioners to prevent leaks.

While this particular model is specified for 10w30 engines, this oil has 5w20, 5w30, and 10w40 grades.

The brand, Valvoline, has earned a good reputation over the years of its existence, and this motor oil is rated almost 5-stars on Amazon by over 4,000 customers. You can use the oil on all kinds of vehicles (cars and trucks).


  • The formulated is fortified with the company’s patented MaxLife technology
  • Includes seal conditioners for leaks protection
  • Contains detergents for thorough engine cleaning


  • Unbeatable price
  • Reputable brand
  • MaxLife technology
  • Resists oxidation


  • Few complains from some users on Amazon

6. Pennzoil High Mileage Motor Oil

Pennzoil High Mileage Conventional 10W-40 Motor Oil for Vehicles Over 75K Miles (5-Quart, Single Pack)
  • Conventional High Mileage 10W-40 engine oil specially formulated to help stop leaks and reduced oil consumption in worn engines
  • Recommended for vehicles with over 75,000 miles
  • Helps prevent sludge and other damaging deposits
  • Provides proven wear protection for engine parts
  • Exceeds the requirements of the following industry specifications: API SN and all previous categories

While we mentioned that full synthetic oils are the best to use on engines with over 100k miles, some conventional oils actually perform better due to the additives and formula used.

The Pennzoil high mileage oil is one of those few conventional high mileage oils you can trust to improve your engine’s performance.

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Available in a 5QT container, this conventional oil is made with a strong formula, fortified to deliver optimal protection against wear and leaks. However, since this is not synthetic motor oil, it is not compatible with most engines. You could mix it with a high mileage oil additive for better performance.


  • Suitable for engines with over 75k miles
  • Cleans sludge and deposits
  • Good for vans, trucks, and cars


  • Unbeatable price
  • Improves fuel economy
  • Delivers better protection against wear


  • Not compatible with most newer vehicles
  • It is not a synthetic motor oil

7. Castrol GTX High Mileage Oil

Castrol GTX High Mileage 10W-30 Synthetic Blend Motor Oil, 5 Quarts
  • Phosphorus Replacement Technology to help extend the life of the emission system
  • Superior dispersancy that fights sludge build up
  • Exceptional oil burn-off protection exceeding industry standards, based on API and ACEA volatility specifications
  • Seal conditioners to help reduce leaks
  • Advanced additives that minimize engine wear

Lastly on our list is a super-performing motor oil from the Castrol brand. It is clearly specified for high mileage engines (engines with over 75k miles), and it comes in different viscosity grades. This top-quality full synthetic engine oil coats the engine’s internal parts to protect them from wearing off.

There are two models of Castrol High Mileage Oil, and they both deliver exceptional performance on old vehicles.

This one comes in a 5QT container; the formula includes superior detergents to remove any dirt or sludge residing inside the engine. Thanks to the inclusion of seal conditioners in the formula, this oil prevents oil leaks.


  • Advanced formula with detergents and seal conditioners
  • Big container (5QT)
  • Full synthetic motor oil


  • Works impressively on high mileage vehicles
  • You can choose from different viscosity grades
  • Reputable brand


  • A few complains from some users on Amazon

When Should You Change Oil On a 100K Miles Engine?

It would be best to change your oil at 7,000 – 8,500 miles intervals, or at most, 10,000 miles. While some oil manufacturer may claim their products can last up to 15,000 miles or more, you shouldn’t listen to that marketing jargon.

Since your engine has already done 100k miles, it needs to be fed with clean oil more regularly than ever. So if your previous drain interval is above 10,000 miles, you need to bring it down to 10,000 miles, or a little bit below – 10k miles should be the landmark.

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  • It is advisable to switch to high mileage oils when you hit 80,000 miles on your odometer
  • Reschedule your oil change intervals, keep it below, or at 10,000 miles (if you use full synthetic oils).
  • If you use conventional high mileage oils, keep the drain intervals below 6,500 miles.
  • Full synthetic oils are the BEST
  • Stick to the instructions and recommendations in your car’s owner’s manual

How To Buy Motor Oils For Cars With Over 100k Miles

High mileage motor oils should be selected carefully because high mileage engines need nothing but the “Best” oil in the market. These factors would help in choosing the best for your 100k miles vehicle.

1. Go For Synthetic Oils

It is best to go for full synthetic high mileage motor oils as they typically offer more benefits than synthetic blends and conventional motor oils.

Notwithstanding, there are some very good conventional oils (ex. Pennzoil high mileage oil) and synthetic blend (ex. Havoline high mileage oil) that deliver good performance on vehicles with over 100k miles.

2. Viscosity and Grade

The viscosity grade of motor oils is an important factor to consider when choosing high mileage motor oils. Since your engine is most likely stressed due to the several miles, it is advisable that you go back and stick with recommended oil grade for the engine.

For example, if you were using 5w20 while your engine is specified for 5w30 or 10w30, at this point (since you’ve hit 100k miles), it is best to stick with the exact grade for your engine.

3. Brand

Of course the brand matters. There are many top brands you can trust for their oil products; brands like Royal Purple, Mobil 1, Amsoil, and Castrol. However, if your engine OEM specified a brand to use, go for the brand’s oil.

What More?

This article has clearly listed the best motor oils to use on engines with over 100k miles; it also reviews the best practices to follow while shopping for new motor oil for your old or high mileage engine.

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