Can it use 87 octane or must use premium?

Asked by Jan 08, 2011 at 09:05 AM about the 2007 Pontiac Grand Prix GT

Question type: General

4 Answers

3,255

Do you know the compression ratio of the engine? If not, do you know what engine it has?

3,255

It is actually best for your engine and performance to use the lowest octane possible. Octane increases the fuel's resistance to ignition to prevent pre-ignition and detonation in high-compression engines.

125

If your Grand Prix is a GT, it only needs regular(87). If it is a GTP, you must use premium. GTPs (supercharged) after 2003 could get away with regular (pemium is preferred), but it could hurt your mileage and performance.

2 out of 2 people think this is helpful.

If you run a high octane engine running a lower octane is really bad for it so don't "always use the lowest octane possible". Use what your car is rated for. If you put a higher octane of gas in a low octane engine you'll just be wasting money, no benefits.

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