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What gas octan to use with 1998 grand prix gt v6 3.8L ?

R

raverockstar

New member
What gas should I use for my 98 grand prix gt 38L v6?

I used regular until now. If it DOES need a premium is it bad to keep using 87?
 


Your 98 3.8 v6 GT is fine running on 87 octane, thats all thats required for a stock naturally aspirarted 3.8 v6 98 Grand Prix.
You normally would only have to worry about running premium fuel if your 3.8 v6 was supercharged(GTP)
 


But I see there's not a straight answer for what octan. What does the manual say? My car has 210k if regular is not good I don't wanna kill it.
 
I have a 1999 3.8 myself, vin K ... no supercharger .. 87 octane is fine for it. Around here it is running $3.70
per gallon as of today. Exxon 91 is $3.99 per gallon
 


TJeno said:
Wouldn't the Premium 89/90/91 be plenty? At least around here, you'd need to buy Octane Boost just to achieve a 93.
Click to expand...

If you 91 octane is your premium, using octane boost won't get you to 93. It might get you to 91.2. Octane boost is a HUGE waste.
 


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