octane question
 

if you car says only use 93 octane and use 89 whAT WOULD happen?

Re: octane question (wm5holla)
 

more details..what car?
mainly loss in performance, if not detonation.

Re: octane question (hybridvteceg)
 

i was just wondering.. my boy has a caddy truck that only takes 94 or 93.. i forget.

Re: octane question (wm5holla)
 

I don't know Caddies, so here's a general answer.

If the car doesn't have a knock sensor, it'll get spark knock, especially when you're into the gas pedal. If you keep doing that for a long time it'll damage the combustion chambers. Maybe put a hole in the top of a piston??

If the car has a knock sensor, it'll back off the spark timing so it won't knock. You'll have less power, maybe enough to notice.

Re: octane question (JimBlake)
 

it seems strange though for the car to require only 93 octane when its not availible in all states. here in cali pump is 91