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90 octane is plenty for your car.
I replace my engine oil and rear dif oil at 500 miles to get all the filings out. Read your owners manual about the oil change intervals and how to reset it. I too do my own oil changes. The car has a very ingenius way to determine oil change interval. I just follow that. When the computer tells me to change the oil, I change it. Never go longer than a year between changes.
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