
Originally Posted by
oj88
It really irks me that car manufacturers don't factor in oil quality in their recommended OCI. It's only common sense that a fully-synthetic oil is better than regular oil. It has better everything... enough so that it really should extend the OCI.
My own intuition tells me that the OCI they have in the manual are loosely based on the cheapest oil that the engine would take. By that logic, you should be able to extend the OCI if you use FS oil. By how much, only a proper UOA can tell the full story.