Reduced Protection: The blended mixture will not last as long between changes as pure synthetic oil. In these cases, adding a small amount of regular oil to reach the proper volume is acceptable to avoid running critically low.
Is It Safe to Mix Synthetic and Regular Motor Oil?
Additive Depletion: Synthetic oils contain higher levels of detergents and dispersants that keep the engine clean. This combination, however, results in a blend that dilutes the advanced additives and performance characteristics of the full synthetic, effectively reducing the benefits you paid for.
The short answer is yes, you can mix synthetic and regular motor oil without causing immediate damage to your engine. Modern refining techniques and additive packages are compatible, so the mixture will not suddenly solidify.
Is Mixing Synthetic and Regular Motor Oil Safe for Your Engine?
However, doing so sacrifices the oxidation resistance and shear stability that make synthetics superior in the first place. This practice ensures you maintain the superior cleaning capabilities, extended drain intervals, and temperature resistance that justify the initial investment.
More About Can you mix synthetic and regular motor oil
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