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Is High-Mileage Motor Oil a Gimmick?

A purpose-built high-mileage motor oil can help improve the longevity and performance of high-mileage vehicles.

Over the past decade, car care companies have come out with a new type of motor oil: high-mileage oil. It's supposed to be especially good for the callenges vehicles that have clocked over 75,000 miles (120,000 km) face. But the big question is: does it really make a difference?

The truth is, high-mileage engines do have unique needs and could benefit from a motor oil designed specifically to address those challenges.

So, what exactly wears down in a car with a lot of miles on it, or one you're not sure how well it's been taken care of? Here are a few common culprits:

Increased oil consumption

Oil consumption is common among high-mileage engines. Over time, they experience increased wear, leading to greater oil consumption.

Using a suitable high-mileage motor oil that is thermally stable and resists volatility can help prevent oil consumption from occurring.

Seal leakage

High-mileage engines with aging seals are more prone to oil leaks. An aging seal loses flexibility, hardens and no longer effectively serves its purpose.

A well-designed high-mileage motor oil provides a boosted dose of seal conditioners to restore and recondition aging seals and help stop leaks.

Sludge and deposits

Over time, engines experience increased sludge and deposit buildup. This can be due to oil breakdown from high heat, low-quality oil, excessive idling or insufficient combustion of fuel.

A quality high-mileage motor oil can provide enhanced detergency, removing deposit buildup to help restore peak performance.

Compression loss

Engines can lose compression as cylinders and piston rings wear, eventually leading to reduced horsepowe and increased blow-by.

A proper fluid film helps counteract compression loss by sealing combustion chambers to maintain performance. A purpose-built high-mileage motor oil is formulated to maintain viscosity and provide proper film thickness in extreme operating conditions.

High-mileage vehicles can still provide reliable performance.

To protect your engine’s performance and help extend its longevity, it’s important to take steps that help counteract those issues. Our testing suggests that some companies are changing their labels to appeal to customers with high-mileage vehicles but not changing the oil inside the bottle.

Pumping new life into your high-mileage car? Don't neglect the heart! Call Cherry Synthetics in Greenville at (252) 917-1677 or visit AMSOIL's online store to give your engine the care it deserves!

Purpose-Built Protection

AMSOIL 100% Synthetic High-Mileage Motor Oil is specifically designed for the unique demands of high-mileage engines, helping extend the life of your vehicle. It delivers purpose-built protection at a time in your vehicle’s life where it could benefit from more-robust maintenance – including boosted detergency and an additive package that fights oil breakdown and leaks.

This may sound too good to be true, so to prove it, we subjected it to independent testing. The result: AMSOIL100% Synthetic High-Mileage Motor Oil reduced sludge by 67%,* demonstrating its cleaning power that helps engines last longer and perform better.