Not unusual to see 300,000 miles on a car.
High mileage vehicles present a unique demand for lubrication. Parts and seals are worn with normal wear, so what the engine needed when new changes as both metal and other components wear. Quality synthetics are engineered to meet the extreme demands of lubrication and cooling. This is the primary reason for the many choices of lubricants on the market today. So, you can't just go by the oil's SAE weight when making a choice of engine oil.
AMSOIL 100% Synthetic High-Mileage Motor Oil is engineered specifically for the unique demands of high-mileage engines with over 75,000 miles (120,000 km). A boosted additive package fights oil breakdown and leaks. It maintains a consistent fluid film that helps counteract compression loss by sealing combustion chambers. And enhanced detergency helps remove deposit buildup to help restore peak performance. Its ability to reduce sludge has now been verified through independent testing. AMSOIL 100% Synthetic High-Mileage Motor Oil reduced sludge by 67%,VV demonstrating cleaning power that helps engines last longer and perform better.
This chart is what resulted from the lab testing. So, the results were that an increasing amount of sludge started to decrease dramatically after changing over to Amsoil High-Mileage oil. This change of 67% reduction occurred over the next 100 hours of operation.
As many folks know, I have had a lot of experience rebuilding engines used both on the road and on the water. While not scientific, it's clear that marine engines that are maintained in the same order as road operation vehicles DO NOT build sludge as their road use engines. A lab analysis of the sludge seems to contain many of the compounds found in tires. This shows the importance of keeping the air and oil filters in good operating order. High-mileage engines that haven't been protected by Amsoil are especially in need ot the specially formulated High-Mileage oil.
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