What type of oil should be used in a high-mileage vehicle?

Using high-mileage engine oil with special additives is particularly beneficial for vehicles that have accumulated significant mileage, usually over 75,000 miles. This type of oil is formulated specifically to address the needs of older engines. It often contains a unique blend of additives that help reduce oil consumption, minimize leaks and oil burn-off, and decrease engine wear. These additives may include conditions for seals, detergents for cleaning deposits, and anti-wear agents to protect engine components.

Moreover, high-mileage oils have a slightly different viscosity profile that supports engine components that may have started to wear or expand over time. This helps maintain better oil pressure and flow, which is critical for the longevity and efficiency of an aging engine.

In contrast, synthetic motor oils with high viscosity can sometimes be too thick for older engines, while conventional oils may lack the protective additives needed for high-mileage vehicles. Diesel engine oils are specifically formulated for diesel engines and may not be suitable for gasoline engines, as their additive packages are different and tailored for the unique operating conditions of diesel powertrains.