Mixing these could lead to precipitation, where the additives clump together and lose their effectiveness. Pouring a 10W-30 into a 5W-30 tank will not change the final viscosity to a middle ground; rather, it will dilute the thicker oil, potentially compromising the film strength needed for proper lubrication.
Best Practices for Mixing Oil Brands Safely
For example, one brand might rely heavily on zinc dialkyldithiophosphate (ZDDP) for older engines, while another uses a more modern ester-based formula. The key is to use the opportunity to get to a shop where you can perform a full oil change with the correct specification.
Drivers often find themselves asking whether mixing oil brands poses any risk to their engine. Viscosity Grade Best Use Case Mixing Risk 5W-20 New fuel-efficient engines Low if same grade 5W-30 Standard passenger vehicles Low if same grade 10W-40 High-mileage or older engines Moderate-High if grades differ When Mixing is Inevitable There are scenarios where mixing oil brands is not just acceptable but necessary.
Best Practices for Mixing Different Oil Formulas Safely
While the base stock might be similar across brands, the specific chemical formulation of the additives is proprietary and varies significantly. Modern lubricant technology is robust, and a single top-off with a different brand will not instantly destroy your motor.
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