Compatibility
It will not hurt your engine if you top off conventional oil with a bit of synthetic oil. However, that will simply dilute the synthetic properties, which will reduce the benefits.
Additives
When you’re looking for the best motor oil brands, you’ll notice that they differ in the type of additives they contain. Most feature some type of anti-foaming agents, conditioners, detergents, dispersants, corrosion inhibitors, viscosity index improvers, antioxidants, and anti-wear agents.
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