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Old 09-16-2007, 10:40 PM   #1
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Default Gas for an L32

I'm looking into a newer model Grand Prix (04 and up) for my wife so I've been hanging around ClubGP to get some questions answered. According to the GP guys a 3800 SC'd L32 (replacement for the L67) can run ok on regular fuel (with no knock) if the engine isn't modded. I downloaded the manual from GM Parts Link for an 04 GP.

The 04 GP manual says...
Quote:
If your vehicle has the 3800 Supercharged V6 engine
(VIN Code 4), use premium unleaded gasoline with a
posted octane of 91 or higher for best performance. You
may also use middle grade or regular unleaded gasoline
rated at 87 octane or higher, but your vehicle’*
acceleration may be slightly reduced. If the octane is less
than 87, you may get a heavy knocking noise when you
drive. If it is bad enough, it can damage your engine.
My 01 Bonne manual says....
Quote:
If you have the 3800 Supercharged V6 engine (VIN Code 1),
use premium unleaded gasoline rated at 91 octane or higher.
With the 3800 Supercharged engine, in an emergency, you
may be able to use a lower octane -- as low as 87 -- if heavy
knocking does not occur. If you are using 91 or higher octane
unleaded gasoline and you hear heavy knocking, your engine
needs service.
Is it ok to run 87+ octane in a S3 3800 SC?
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Old 09-16-2007, 11:10 PM   #2
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IMO,just to be on the safe side,I'd run 91 or better
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Old 09-17-2007, 01:05 AM   #3
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With a Gen V i'd think it would be more important to run premium.
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Old 09-17-2007, 01:45 AM   #4
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I would definitely vote to be on the safe side. Premium doesn't cost that much more to risk damaging an engine.
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Old 09-17-2007, 06:37 AM   #5
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Well here'* the deal. My wife just got a job about an hour away. She'* going to be in the car for two hours a day so she'* going to be putting some serious mileage on the car. She doesn't want to buy anything that runs on premium fuel. If the L32 in the GP will run on regular, I'll buy a GTP, if not, it'* going to be a NA GT.
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Old 09-17-2007, 07:46 AM   #6
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Looks to me that it would like 91...isn't that mid grade in your parts?
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Old 09-17-2007, 07:52 AM   #7
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Quote:
Originally Posted by BillBoost37
Looks to me that it would like 91...isn't that mid grade in your parts?
Looks like anything over 87 is ok.
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Old 09-17-2007, 08:05 AM   #8
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Right..with reduced performance. Which may also mean fuel mileage.
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Old 09-17-2007, 08:09 AM   #9
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Right, but in an L67 you'll do damage.
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Old 09-17-2007, 08:15 AM   #10
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We did a little test on the GXP (different engine, I know). The book says it is fine to run regular, but better performance with premium. Over five tanks of gas with each type our mileage was so much better with premium that the differential between regular and premium would have to be about $0.50/gallon to make running regular more economical than premium. We were unable to detect the same difference for the 96 SSE (L36) so always run regular in it, although some people swear their L36'* run better on premium. I don't know if that is true or not.

So if your manual says you will get better performance (and mileage by default) with premium, it will be to your benefit to run premium. But I can see where fuel is a deciding factor. My daily driver is a 92 Nissan with two hamsters and a rubber band- about 32-34 mpg on regular. 0-60 ? Yes, that'* how fast it goes... from 0 to 60.
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