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

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  1. #1 What gas octan to use with 1998 grand prix gt v6 3.8L ? 
    raverockstar
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    Default 08-18-2012
    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?
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  2. #2 Re: What gas octan to use with 1998 grand prix gt v6 3.8L ? 
    231FUN
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    Default 08-18-2012
    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)
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  3. #3 Re: What gas octan to use with 1998 grand prix gt v6 3.8L ? 
    dsmuts
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    Default 08-18-2012
    na or sc? NA 87 octane, supercharged 93 octane.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  4. #4 Re: What gas octan to use with 1998 grand prix gt v6 3.8L ? 
    TJeno
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    Default 08-18-2012
    Quote Originally Posted by dsmuts View Post
    na or sc? NA 87 octane, supercharged 93 octane.
    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.


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  5. #5  
    iRideGTP
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    Default 08-18-2012
    Premium is 91 or higher

    Sent from my SGH-T679 using Tapatalk 2
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  6. #6 Re: What gas octan to use with 1998 grand prix gt v6 3.8L ? 
    Fivefingerdeathpunch
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    Default 08-18-2012
    Na gt = 87

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  7. #7 Re: What gas octan to use with 1998 grand prix gt v6 3.8L ? 
    dsmuts
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    Default 08-18-2012
    Quote Originally Posted by TJeno View Post
    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.
    Premium around here is 93 I wasn't thinking about the less fortunate lol
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  8. #8 Re: What gas octan to use with 1998 grand prix gt v6 3.8L ? 
    LS2 BLAZER
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    Default 08-18-2012
    been using 87 in my GT for all 11 years we've had her...
    2001 Grand Prix GT - stock (for now )
    2007 Trailblazer SS - back under the knife , motor #4 on the way
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  9. #9 Re: What gas octan to use with 1998 grand prix gt v6 3.8L ? 
    raverockstar
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    Default 08-18-2012
    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.
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  10. #10 Re: What gas octan to use with 1998 grand prix gt v6 3.8L ? 
    Fivefingerdeathpunch
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    Default 08-18-2012
    Your manual will say 87, and your fuel door should say regular unleaded.

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  11. #11 Re: What gas octan to use with 1998 grand prix gt v6 3.8L ? 
    bruceb
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    Default 08-18-2012
    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
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  12. #12 Re: What gas octan to use with 1998 grand prix gt v6 3.8L ? 
    blakgtp
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    Default 08-18-2012
    the thing about 91 for a gtp is 91 usually says +/- 2
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  13. #13 Re: What gas octan to use with 1998 grand prix gt v6 3.8L ? 
    dsmuts
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    Default 08-18-2012
    Quote Originally Posted by raverockstar View Post
    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.
    Do you have a supercharged car?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  14. #14 Re: What gas octan to use with 1998 grand prix gt v6 3.8L ? 
    stealthee
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    Default 08-18-2012
    Quote Originally Posted by TJeno View Post
    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.
    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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    1991 Mitsubishi 3000GT - Many mods to come
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  15. #15  
    Kolton Lock
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    Default 08-18-2012
    Quote Originally Posted by Fivefingerdeathpunch View Post
    Na gt = 87
    Quote Originally Posted by Fivefingerdeathpunch View Post
    Your manual will say 87, and your fuel door should say regular unleaded.
    lol you're really trying to get the point across

    To the OP, the only reason you would ever run premium is for mods or if you're just that person who wants to waste money on a NA car.
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  16. #16 Re: What gas octan to use with 1998 grand prix gt v6 3.8L ? 
    dsmuts
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    Default 08-18-2012
    I totally missed that it said gt in the title. Use regular unleaded gas 87 octane.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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