Most conventional and synthetic motor oils share the same fundamental base: a refined base stock that makes up 70% to 90% of the final product. For optimal protection, it is best to stick to the same brand and line of products, but topping off with a different brand in an emergency is not a disaster.
Viscosity Match When Mixing Different Oil Brands
If you mix a 5W-30 with a 5W-30 from a different brand, the resulting mixture will retain the correct viscosity for proper lubrication. Conventional Blending A common question is whether mixing synthetic and conventional oil is a bad idea.
Synthetic oils are engineered to be backward compatible with conventional mineral oils. Performance and Viscosity Considerations Viscosity Grade Compatibility The most critical factor when mixing oil is not the brand name, but the viscosity grade.
Viscosity Match When Mixing Oil Brands
Understanding Engine Oil Composition To understand why mixing brands is usually safe, it is helpful to look at what engine oil is made of. , 5W-30 or 10W-40).
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