2000 pontiac Grand Prix GTP?

Question

Is ti true that you have to put in 91 octane or higher?
if so why?

Is it true that you have to put in 91 octane fuel or higher?
if so why?

Answer 1

Read your owners manual. Higher octane will give you better performance but it isn't always nessary. My car requires premium but I can use regular, it just won't perform as well.

Answer 2

It may or may not be true. Check your owner's manual (if you have it) or check with the dealer. The point of using higher octane rated fuel is to avoid ping AKA knock AKA detonation AKA preignition. I have a 2005 GTP and the manual states I can use any unleaded gasoline rated at 87 octane (regular) or higher. The caveat is that I won't get full performance out of the engine using the lower grade fuel. The deal is the engine is basically designed to run on 91. The power and torque are rated using 91. There is no benefit to using anything more than 91. If I use something lower, the engine will ping, maybe not immediately, but certainly under high load or under boost. The anti-knock sensor built into the engine will detect pinging well before it gets bad enough to damage anything. The sensor will tell the computer to yank all the spark advance out. The spark plugs will fire sooner than normal to combat the ping. Since the intake charge is therefore being burned sooner, energy is wasted, so you lose power. I personally buy premium gas. I don't see the point of paying out for a fancy engine and then crippling it with cheap gas.

Answer 3

The fuel requirement spec for your vehicle should be listed in the owner's manual (the "worlds most expensive unread book"), and near the fuel filler cap. Higher octane fuel is generally required by the higher performance oriented engines that have the ignition timing advanced a little more than the average powerplants of more ordinary vehicles. Octane is AKI (anti knock index), which is a measure of a fuel's ability to resist "knocking" (meaning to ignite BEFORE the actual spark plug fires). Hope this explains it well enough.

Answer 4

Check the owner's manual or the fuel door for the recommended fuel requirements.
If it isn't required, use the lower octane fuel. it is every bit as good as the higher octane, but has less anti-knock compound. that is the ONLY difference. All of the other chemicals, detergents and additives are exactly the same.
There is no more energy stored in the higher rated fuel.
For a clear discussion of octane, go here------->

http://auto.howstuffworks.com/question90.htm

...then you will understand what is important and what is not.

Good Luck

Answer 5

The higher the compression the higher the octane needs to be so it doesn't pre ignite. So go with what the manual says...

Answer 6

It is a Supercharged engine you may have to. Did you try using regular or midgrade octane gasoline to see if the engine hesitates or pings?

Answer 7

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