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If you're primarily driving on the street and want to keep the recommended 5000 mile oil change interval, you should definitely not use the Motul 300V, as it is not intended to be used on street cars for the long term. It's a racing oil designed to be changed between track events. As someone else mentioned Mobil 1 is a pretty easy to get, inexpensive, and perfectly reasonable option in a street car. I personally use AMSOil, although it's kind of expensive, I like it well enough.
What tells you if you need to up your OCIs or have unusual wear from E85 is getting a used oil analysis done.
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