Synthetic oil is basically like very refined regular oil…since it’s artificially made they have very tight control over exactly what’s in it and what the properties are. They can match it exactly to what the engine needs (lubricity, viscosity, resistance to forming sludge, etc.) and hit that target with very consistent results.
Natural oil is a mixture of natural compounds…its most the stuff you want but there’s always some other stuff along for the ride that cause it to not be exactly what you want it to be without a lot of extra refining.
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