Comments on: Should You Be Using Regular Gas When Premium Gas is Recommended?

By: Mark F

Mark F — Fri, 31 Jul 2009 16:32:59 +0000

Premium gas makes no difference on an engine designed to run on regular. That won't help. You may have a bad Cat or it may be a bad O2 sensor, probably the downstream one. You will have to get it tested to be sure.
References :

By: mdk68gto

mdk68gto — Fri, 31 Jul 2009 16:30:59 +0000

try a tune up and stick with what the book calls for. no need to use the high octane if you do not need it. the 3 liter engine is not a high compression engine, and it does not run that hot to Create problem with pre-detination. octane is a resistance to burn . it does not mean that you are dumping raw fuel into the exhaust. the previous owner is an idiot.
References :
ase certified master tech.

By: Steve from PA

Steve from PA — Fri, 31 Jul 2009 16:28:59 +0000

The only time Ive heard of high octane doin harm was with race fuel(leaded) 110 octane in car designed for premium…eventually the cats would burn out if you didn’t cut it with the required octane. But there should nt be that much of a difference between 87 and 89…Half the time that regular is closer to mid grade any way out of the pump..
References :

By: my_best_guess

my_best_guess — Fri, 31 Jul 2009 16:26:59 +0000

Premium is waste of money. Sounds like you may have some poor combustion on bank 2, could be weak spark from a plug or wire. Is it skipping at all?
References :

By: Mr. Wiseman

Mr. Wiseman — Fri, 31 Jul 2009 16:24:59 +0000

Yes it prevents build up in your cylinders and pistons, and does harm your car.
References :