87 octane or 93 for BMWs
5 Answers
Low octane gas can damage your engine if you end up with detonation (ping) the computer can compensate for low octane to a point but you will probably lose power and fuel economy due to retarded timing.
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I was told that regular unleaded is ok to use unless your are experiencing issues like pinging... otherwise not necessary.
Premium is a must it should say on your gas cap area.