Originally posted by fire90bird:
My owners manual of my 99 grand prix GT states specifically that the car is built for regular gas and that premium is not good for the engine??
You can put premium in there but it won't do anything. The computer may adjust timing but you won't get a power increase or better MPG. It may feel like its driving smoother but thats it. All you would be doing is intentionally paying extra for gas.
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GenV GTP engine, 12" Brakes, CAI, 3" DP, HighFlo Cat, 180 T-Stat, Aeroforce Gauge, Front STB, Stinger Fiberglass hood, Reflective Graphics.
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