Q: What grade of gas should I put in my 2008 grand prix

asked by on

My car start knocking when I put 87 in my gas tank

My car has 121000 miles.
My car has an automatic transmission.

Your car should run just fine on 87 octane fuel unless you have other modifications to your car such as a super charger or turbo charger. The knocking may suggest that you have something else wrong with your engine. Your car’s model came in a couple of different engine packages, one is a GT and the other is a GTP which is a super charged model. The GT model will run just fine on 87 octane fuel. The GTP model will need 91 octane fuel in order to keep it from knocking due to the advanced timing of a super charged engine.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. What grade of gas should I put in my 2008 grand prix

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: I have a 2002 pontiac Grand Prix gt. My engine light is on and my fuel gauge always reads empty. Any idea why?

Claimed by Jeff Engstrom

Q: Q: My air won't blow

I would recommend a suspension inspection to determine what has happened after the pot hole impact. More than likely your fan is shorted to power and the impact is unrelated but the inspection should reveal the true issue. Maybe some...

Q: Need a way to drain out 1 year old gasoline sitting in an otherwise good car.

Hi there. If the fuel is only a year old, then it should be fine to drive off and fill up with fresh gas as it runs out. If you really want to get the fuel out of the tank,...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.