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Discussion Starter · #1 ·
I currently put 87 (Regular) octane in my v6 Cougar.

My father has a Mini Cooper-S supercharged that requires premium gas.

I will be getting a Cobalt SS soon so I am wondering if it would be ok to put 89 octane (Super) instead of 93 (Premium)

Could this possibly hurt or damage the car over a long period of time?
 

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You CAN run regular fuel in the LSJ although Premium is "recommended"
The LSJ has a knock sensor system so that if you DID get a bit carried away and boosted it up in high ambient heat, it will automatically retard timing to prevent damage.If you dont spend significant periods of time under boost, it runs just fine on 87 octane.
HTH
WOT
 

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CoBIZZLE said:
Hey WOT, just curious I have always wondered what HTH means in all your posts??!?!?
hope that helps???
 

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HEY!!!! WATCH IT BUDDY!!!
You see the title!!!.... j/k LOL :D Yeah I felt like an idiot oh well.
I think I can make me, myself, and I look dumber than anyone else can make me look. LOL :rolleyes:
 

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CoBIZZLE said:
HEY!!!! WATCH IT BUDDY!!!
You see the title!!!.... j/k LOL :D Yeah I felt like an idiot oh well.
I think I can make me, myself, and I look dumber than anyone else can make me look. LOL :rolleyes:
lol... i have an arsenal of owned pictures... dont give me a reason to use them :D
 

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I used to put 87 octane in my RL and it ran fine, under both normal driving and "spirited" (not racing, thats dumb) driving. Recently I got a raise and am slurging on premium (91 octane here). Sadly its now at 106.9 cents a litre. Stupid ass gas prices, I spend almost 2/3's as much money on gas as I do for my monthly car payment..lol.
 

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CoBIZZLE said:
It recomends 93. And hey, its not THAT much more expensive, only $3.00 a tank!

Actually, GM calls for a max of 91 octane for US spec cars. 93 is not available everywhere.
 

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if you run 87 octane in a f/i car, you are asking for an early demise of your motor.

"premium gas recomended" is a nice way of saying, use it or lose it, boost that is.
 

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I use 93 Octane in my SS, wouldnt even think about using anything but 93... Before the Cobalt I had a Plymouth Laser RS (Same as Talon/Eclipse) which was N/A and I used Mid Grade Gas (89) along with Mobile 1 Synthetic Oil (10w30) and the car seemed to run great. Im really happy that our Cobalts come with an initial Mobile 1 Synthetic Oil (5w30) from the get go. One thing I think worth mentioning though is when I went to the dealer, he opened up the fuel tank and said "it doesnt say needs premium so i guess that means it can use whatever" but in the manual it clearly says you will get better performance out of 93 grade gas but will run with 89 grade... if your spending 22 grand usd or higher on a car, how can you be cheap and not put premium gas in the car... come on guys!
 

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Yeah like mentioned above... With a F/I car, you want to put premium fuel in there to eliminate the possibility of having your car knocking, getting pissed, and pulling timing on you (similiar to putting you on time out or sending you to the corner).... 91 Octane (Cali Piss Water) is as low as i would ever go in a F/I car i care about.
Someone should even try out an octance booster to see how (if any at all)much better it performs in the SS.. I Use NOS Racing Formula Octane Booster or the Lucas Octane Booster and it works amazingly.....
 
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