Perhaps you are topping off your oil between changes and only have conventional oil available. , 5W-30, 10W-40) and often the required API or ACEA performance standards.
Debunking Myths: Mixing Conventional and Synthetic Oil Safely
Performance Impact of Mixing While a small top-off of conventional oil in a synthetic blend won't cause immediate catastrophe, the mixture will compromise the performance advantages of the full synthetic. If you are transitioning from conventional to synthetic, a complete flush is not always necessary, but a full drain and replacement is ideal.
This ensures you are getting the full protection of the new, clean synthetic oil without any residual contaminants or diluted performance from the old conventional oil. Best Practices for Oil Changes To ensure optimal engine performance and longevity, it is best practice to use the same type of oil consistently.
Debunking Myths: Mixing Conventional and Synthetic Oil Safely
Compatibility and Engine Safety From a compatibility standpoint, mixing the two types of oil will not cause a chemical reaction that destroys your engine. Regular, or conventional, motor oil is refined from crude oil, resulting in a product with a more inconsistent molecular structure.
More About Can you mix regular oil with synthetic
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