10 Best High Mileage Engine Oil 2025 in the United States

The Mobil 1-123840 Extended Performance High Mileage 5W-20 engine oil is a full-synthetic oil designed for cars with over 75,000 miles. One of its main strengths is its ability to go up to 20,000 miles between oil changes, which is particularly beneficial for those who do a lot of driving and want longer intervals between maintenance. The oil uses Mobil 1's Triple Action+ Formula, which aims to provide exceptional engine performance, protection, and cleanliness, along with improved power. It meets the ILSAC GF-6 standards, which means it helps protect your engine from low-speed pre-ignition and timing chain wear, and it can contribute to better fuel economy.

It also offers excellent protection in extreme temperatures, up to 500 degrees Fahrenheit for heat and down to -40 degrees Fahrenheit for cold, which is useful for varying climates. Additionally, it helps in preventing deposits and sludge buildup, potentially extending the engine's lifespan. However, as a full-synthetic oil, it may be more expensive than conventional oils, which could be a consideration for budget-conscious users.

This oil is likely best suited for drivers who prioritize long-term engine health and are willing to invest a bit more upfront for potentially lower maintenance costs down the line.

Mobil 1 Extended Performance High Mileage Full Synthetic Motor Oil 5W-30 is tailored for vehicles with over 75,000 miles, and it's designed to last up to 20,000 miles between oil changes. This makes it an excellent choice for those looking to extend the time between oil changes without compromising on protection.

The oil leverages Mobil 1’s Triple Action+ Formula, which promises to enhance engine performance, provide superior protection, and maintain engine cleanliness. This product meets the ILSAC GF-6 standards, offering protection against low-speed pre-ignition and timing chain wear, which are critical for the longevity of high-mileage engines.

It also performs well in extreme temperatures, providing protection up to 500 degrees Fahrenheit and down to -40 degrees Fahrenheit, which is beneficial for users in varying climates. One of the standout features is its ability to help prevent deposits and sludge buildup, which can be particularly troublesome in older engines. However, while it offers numerous benefits, the cost of full-synthetic oil like this can be higher compared to conventional oils. It’s marketed under the reputable Mobil brand, which is known for quality, and it’s certified to meet specific industry standards. This oil is a robust option for car and truck owners who prioritize long-term engine care and are willing to invest in premium oil for their high-mileage vehicles.

The Valvoline Full Synthetic High Mileage with MaxLife Technology SAE 5W-20 Motor Oil is a strong contender for those driving vehicles with over 75,000 miles. One of its major strengths is its full synthetic formula, which is engineered to prevent engine breakdown and extend engine life. The inclusion of Enhanced MaxLife Technology is particularly beneficial for older engines as it helps prevent oil leaks and reduces oil consumption, making it a cost-effective option in the long run.

Additionally, the oil offers 50% better wear protection than the industry standard and provides extra defense against deposits, sludge, corrosion, and rust—key concerns for high-mileage vehicles. The oil meets or exceeds several important certifications (ILSAC GF-6A, API SP, API SN with SN Plus, API SN), ensuring it adheres to high-quality standards. It is also American-made, which could be a plus for those who prefer domestically produced products.

However, one potential drawback is that high-mileage synthetic oils like this one can be more expensive than conventional oils. Additionally, while the 5W-20 viscosity is suitable for many makes and models, it may not be the best choice for all engines, especially those that require a different viscosity. This product is ideal for drivers who want to invest in the longevity and performance of their high-mileage vehicles.