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One of my good friends had an older BMW 7 series he had bought used. Very shortly after purchase the car started running poorly, he took it to three different shops and spent $2500 in repairs. My friend finally went to the BMW dealership, where he should have gone to begin with. The service manager asked him several questions about what had been done to the car, ask what kind of fuel he bought and he replied premium. The service guy stopped right there and said that's your problem, this engine was designed for regular. After my friend ran out the premium and put in regular the car ran just fine. Regular was 87 octane, premium was 91. Octane does make a difference.
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