Did I just read the GTP requires Hi-Test ?? I'm about to purchase a pristine '99

Asked by Bill Mar 11, 2013 at 11:08 PM about the 1999 Pontiac Grand Prix 2 Dr GTP Supercharged Coupe

Question type: General

3 Answers
177,545

tenspeed answered 11 years ago

Try both grades and use the type that gives you the best miles per gallon.

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18,685

munron answered 11 years ago

No, do not choose your fuel for miles per gallon! That's not what its for. Use the fuel recommended by the manufacturer, which in the case of the GTP is midgrade or premium. Check the owner's manual for your specific application to be sure. The correct fuel helps the engine operate at the corrrect temperature and that is necessary for the overall health of your engine.

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69,815

John answered 11 years ago

Low grade fuel in a forced induction engine or an engine with a high compression ratio will cause predetonation. Predetonation can bend rods if it detonates early enough.

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