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I have only ever ran Motul 300v 5w30 in my car, aside from what came in it from the factory. I have done many track days, some with 120 degree ambient temperature.
I have gone 10,000 miles consistently on e85. I had Blackstone run a few reports and they were saying I could even push 12,000 miles.
Now that I am boosted I change it around ~5000k miles just for peace of mind.
Do I recommend doing this? Probably not, but I got lazy and tired of spending $120 every 2 months to change the oil.
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