This is particularly vital for flat-tappet camshafts found in many performance or older engines, preventing rapid cam lobe wear that would otherwise degrade power and efficiency. Selecting the wrong viscosity negates the benefits of the specialized additives, potentially causing more harm than good.
Best High Mileage Oil Bearing Protection and Additive Benefits
Additive Primary Function Benefit for High Mileage Engines Seal Conditioners Restore flexibility to rubber seals Reduces oil leaks and consumption Anti-Wear Agents Create protective metal barrier Protects increased internal clearances Antioxidants Slow down oil oxidation Extends oil change intervals Detergents Keep internal surfaces clean Controls sludge in aging engines When to Make the Switch. Viscosity and Application Viscosity remains a fundamental factor, regardless of the mileage threshold.
As clearances increase due to the microscopic removal of metal over time, components like bearings and cylinder walls require a thicker protective film. Over years of thermal cycling, engine seals made of neoprene or similar polymers can harden and shrink.
Best High Mileage Oil for Bearing Protection
Zinc dialkyldithiophosphate (ZDDP) levels are often elevated in these formulations to create a sacrificial layer on metal surfaces. As seals and gaskets degrade, they lose their ability to hold pressure and retain oil, leading to increased consumption and potential leaks.
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