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You don't need to put in anything more than what the car calls for. All octane does is reduce ping so if you only need 91 which is what an ap1 takes I don't know about the ap2. You don't need anything more all you are doing is wasting your money. I really don't care about the oil issue it's 10W-30 and I use AMSoil an I change it every 3K where as I put gas in it every 3rd day.
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