low octane gas [Archive] - GrandAmGT.com Forum


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03-07-2005, 10:13 PM
Ive read most of the threads about using 93 octane gas but what about lower octane? because of money and "just enough to get me home" reasons i put 86 in tonight, prolly wont hurt anything right? ive heard of people usin like 84 and it fouling the spark plugs and throwing an SES, but 86 should be ok for now, i only used a gallon and a half

03-07-2005, 10:37 PM
I use 87 octane ever since the day i drove the car off the lot.

Anything over 89 is a waste, on stock engine internals the combustion ratio isnt high enough. Running 91,93 is a waste of money. Its a debatable issue, people swear on stock internals that 93 or 91 octane helps performance, but what ive read many experiments by mechanics, etc that they disagree... so who knows.

03-07-2005, 10:50 PM
In our relatively low compression pushrod engines 86 or 87 will do you just fine. As SC/T GrandAm said, this topic is up for debate, but the possible gains you would get by going to 90+ will not be of much use in everyday driving on a mostly stock motor. Personally I only put in premium when I dump fuel injector cleaner into the tank or when I go to the track.

03-07-2005, 11:14 PM
I didn't even know there was an 84 octane or anything lower then 87 for that matter...

03-08-2005, 12:46 AM
Yeah, its in Central NY, its Oneida Indian Nation gas stations that sell 86, so the lower octane wont hurt anything? I wasnt really wondering about using higher, if anything the highest i would go is 89.

Mike Jung
03-08-2005, 04:19 AM
GM recommends 87-octane or higher.

03-08-2005, 06:18 AM
I run 87 or 89 - IN MY MUSTANG. Honestlly, you will not see a differance. You can run 87 all day w/o problems. For myself with my mods, I need to run 89 or 91 because of my timing advanced.

03-08-2005, 06:35 AM
87 is fine.

I run 98 in my Shadow :D. Cause thats the lowest available at the track, 104 will just grenade it. hahaha.

03-08-2005, 11:28 AM
I run Mobile 89 or 93, but usually 93. I've heard many claims that Mobile's 93 will keep your injectors cleaner than lower octanes will. I can't say weather it really does or not, but I keep a full tank of 89 w/ sta-bil fuel in my GA over the winter while I store it. I like to run the 93 to clean out the system after it goes back on the road.