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can i use 87 octane?

  1. 7 Series - E65 / E66 (2002 - 2008)
    This past weekend I was literally running on fumes (less than 10 miles to go) and I pulled into the nearest gas station. They were all out of premium so I said screw it how bad can it be once and filled it up. Noticeable decrease in power, slight pings and knocks and terrible gas mileage. On...
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