As internal combustion engines age, components like valve guides, piston rings, and cylinder bores experience increased clearances due to normal wear. Selecting the Right Viscosity Choosing the correct viscosity grade remains critical, regardless of whether the oil is formulated for high mileage.
Motor Oil High Mileage Owner Manual: Understanding Your Engine's Needs
This is categorically false; the seal conditioners are only effective on components that have already begun to degrade. However, the specific requirements depend heavily on the engine’s design and the quality of the original lubricant.
However, older engines with looser tolerances might benefit from a slightly higher viscosity, such as 10W-40, which provides a thicker cushion to protect worn components. It tackles the specific issues of age-related wear rather than treating generic symptoms.
Motor Oil High Mileage Owner Manual: Understanding Seal Conditioners and Viscosity for Aged Engines
This mechanical wear creates pathways for oil to bypass the rings, leading to increased consumption and potential oil pressure issues. In many cases, high mileage oils are available in the same viscosity ranges as conventional oils, such as 5W-30 or 10W-30.
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