Gas Octane Confusions... - Pontiac G6 Forum
 
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post #1 of 14 (permalink) Old 03-15-2009, 12:28 PM Thread Starter
 
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Gas Octane Confusions...

Hi guys I am very confused, I have a base model 2006 pontiac G6 Sedan with a 3.5L V6 and the person or dealership that I purchased it from told me to use 91 octane premium unleaded, which is the highest gas quality for octane that you can purchase at most gas stations, but as I read online my car only required 87 octane, which is the cheapest and lowest octane available at most gas stations. So who is correct and do you guys have a offical, real list of which gas is required for my car? If you could help me out because I dont want to be putting a higher octane than is required or put a lower octane that is required, kind of like goldy locks and the three bears hahaha Thank you so much for your help
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post #2 of 14 (permalink) Old 03-15-2009, 01:09 PM
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If you have a stock G6 engine you can use 87 octane. Usually an engine with higher compression needs high octane to prevent pre-detination in the combustion chamber.




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post #3 of 14 (permalink) Old 03-15-2009, 02:28 PM Thread Starter
 
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oh

so a 3.5L V6 With my G6 is perfectly fine with 87 unleaded octane gasonline correct? what engines need the 91 octane premium like the 3.9L V6 versions or what?
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post #4 of 14 (permalink) Old 03-15-2009, 03:45 PM
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Quote:
Originally Posted by hitman1cs View Post
so a 3.5L V6 With my G6 is perfectly fine with 87 unleaded octane gasonline correct? what engines need the 91 octane premium like the 3.9L V6 versions or what?
To answer your question, an engine with 10.5/1 or higher compression should run 92 or higher octane. There's a lot of chemistry involved in octane ratings. Some people feel the higher octane works better in their car some say there's no difference. I feel that the higher octane fuel I use is worth it, to me it seems to give me better gas mileage on the interstate (I drive 100 miles per day to work.)
I run 92 octane, I always have and I always will. IMO, 92 octane burns cleaner and helps to prevent any build up of carbon deposits and such in the cylinder, piston head, valves and will keep your exhaust system cleaner too. The way I see it the extra $2 per tank is worth it.




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Last edited by geewhiz; 03-15-2009 at 03:54 PM.
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post #5 of 14 (permalink) Old 03-16-2009, 02:01 PM
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I agree about the better gas mileage. I was using 87 for a while and switched to 91(the best that is offered here) and I saw a difference. Well worth it.
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post #6 of 14 (permalink) Old 03-16-2009, 06:58 PM
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Unless you have either a 91/93 tune or have a supercharger, or your car specifically recommends it, buying premium fuel is placebo. You want it to work better in your car and damn well you'll believe it even if it's a lie. No offense or anything. I've heard that using premium fuel on cars that aren't designed for it can actually cause more harm than good.

87 is perfectly fine for the G6, especially a base model, but this is just my humble opinion. But you might want to consider gas that has the extra detergent like Shell or whatever. But I firmly believe that premium fuel isn't a necessity.

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post #7 of 14 (permalink) Old 04-22-2009, 01:06 PM
 
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So what about for a 3.8 v6? in the G6 GTP I've been using 87 because I didn't think it'd be necesary... I used to own a 98 Grand Prix GTP supercharged so I used the highest octane there was, which was 93. Then I had a camaro RS with the 3.8 V6 and I kept using the 93 octane just out of habit.
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post #8 of 14 (permalink) Old 04-22-2009, 01:11 PM
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Quote:
Originally Posted by blkGTP6speed View Post
So what about for a 3.8 v6? in the G6 GTP I've been using 87 because I didn't think it'd be necesary... I used to own a 98 Grand Prix GTP supercharged so I used the highest octane there was, which was 93. Then I had a camaro RS with the 3.8 V6 and I kept using the 93 octane just out of habit.
87 is fine for all G6 Models/Years IF THEY ARE STOCK. Again if you have a WAMS 91/93 tune or if you car has a super/turbo charger you'll need a higher octane. But all models of the G6 only need 87, anything higher is a waste of money.

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post #9 of 14 (permalink) Old 04-22-2009, 01:19 PM
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Quote:
Originally Posted by geewhiz View Post
To answer your question, an engine with 10.5/1 or higher compression should run 92 or higher octane. There's a lot of chemistry involved in octane ratings. Some people feel the higher octane works better in their car some say there's no difference. I feel that the higher octane fuel I use is worth it, to me it seems to give me better gas mileage on the interstate (I drive 100 miles per day to work.)
I run 92 octane, I always have and I always will. IMO, 92 octane burns cleaner and helps to prevent any build up of carbon deposits and such in the cylinder, piston head, valves and will keep your exhaust system cleaner too. The way I see it the extra $2 per tank is worth it.
Don't forget... higher the octane the hotter it burns therefore adding horsepower... mind you it is very minimal but still there nonetheless..
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post #10 of 14 (permalink) Old 04-22-2009, 01:52 PM
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If you want to find out if you need a higher octane rating in your car, run the same test that was used in oil refineries for many years, the ping test. If your car's engine pings then use a higher octane. Octane's function is to prevent pre-detonation in the combustion camber.




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post #11 of 14 (permalink) Old 04-22-2009, 02:47 PM
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Quote:
Originally Posted by geewhiz View Post
If you want to find out if you need a higher octane rating in your car, run the same test that was used in oil refineries for many years, the ping test. If your car's engine pings then use a higher octane. Octane's function is to prevent pre-detonation in the combustion camber.

lol pre-detonation...

Yes the ping test would be a good test. I still think that it's a waste on an unmodded G6, but we could disagree back and forth all day.

okay I admit that I do run a tank every so often of 89 or 93 but that's the extent of it. I ran 89 on my Lumina a few years back and it made absolutely no difference if I used 87 or 89...it could run on pork fat I think if I tried.

Keith

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SOLD 11/20/2010

Last edited by KB G6; 04-22-2009 at 02:49 PM.
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post #12 of 14 (permalink) Old 04-22-2009, 02:50 PM
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Okay, we agree to disagree.




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post #13 of 14 (permalink) Old 08-18-2012, 06:53 AM
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i just recently switched to super unleaded and have seen my 2005 g6 94,000 miles a spike in engine power and actually running at 28 mpg......
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post #14 of 14 (permalink) Old 08-18-2012, 07:33 AM
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Haha missed this thread originally - interesting wheat67 that you found a difference - maybe because the engine's got some miles on it. I tried a few tanks of 93 when I first got the car and there was no noticeable diff. in power and none at all in mpg.

And more to the point of the original poster, who is probably long gone from the forum, but still good advice all alround - ALWAYS believe what the dealer tells you over what the manual says




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