hey what's up guys i'm new here.just bought a 91 crx si with a dohc zc. so i just recently found out that these engines are recommended to take 91 octane. ive been putting 87 on mine just wanted to know if i'm doing Any harm to the engine.just really paranoid because i just replaced the dizzy for it yesterday due to an internal oil leak.was that the cause of the wrong octane? should i drain my gas tank and replace it with 91? i still have like a lot of gas in there.