Some high-performance or turbocharged engines mandate the use of full synthetic oil due to tight manufacturing tolerances and extreme operating conditions. The viscosity—the oil’s resistance to flow—may also shift toward the characteristics of the conventional oil, affecting cold-start protection.
Best Practice for Mixing Synthetic and Conventional Oil Types
Performance Impact and Dilution Mixing the oils results in a compromise. When you mix the two, you are essentially blending these distinct chemical philosophies, which leads to the next point regarding the impact on performance.
You will not lose the protection provided by the synthetic component, but you also will not fully benefit from the premium additives and viscosity index improvers found in the synthetic portion. Filters are designed to catch contaminants and byproducts of oil degradation.
Best Practice for Single Type Oil Mixing Advice
Using a high-quality filter is recommended to ensure any resulting contaminants are captured efficiently. To make an informed choice, it is essential to understand how synthetic and conventional oils differ at a molecular level.
More About Can i mix synthetic and conventional oil
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