Once in a while I have been putting 89 Octane in my 02 Grand Prix GT. Is this safe for the engine?? I have the 3.8 V6 (not supercharged).
Thanks
89 Octane in 02 GP GT
Apr 10, 2004
4 Replies
I think that 87 is recommended so it's not doing any harm.
Except to his wallet....
On my 94 3.8 Trans Sport, going from 89 to 91 octane drops the knock count significantly on the OBD scanner. Going to 93 makes no more difference under normal conditions.( with 91, the count is virtually zero) It MAY help when towing the trailer.
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required