Premium gas?
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This is a discussion on Premium gas? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Does the WRX need premium gas. I thought engines with high compression ratios (10:1 and up) only benefit from the ...

  1. #1
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    Premium gas?

    Does the WRX need premium gas. I thought engines with high compression ratios (10:1 and up) only benefit from the higher octane.

    Thanks,
    Matt

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    Moderator   Sasquatch's Avatar
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    First post? Welcome to the club! Yes, if you have a WRX, premium petrol is the cocktail of choice.

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    Registered User cbr600f3's Avatar
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    Quote Originally Posted by mucky
    Does the WRX need premium gas. I thought engines with high compression ratios (10:1 and up) only benefit from the higher octane.

    Thanks,
    Matt
    Yes premium is your pal. It should say that on your fuel door.
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    Registered User silver_rex_4eat's Avatar
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    yes at least on my MY02 sedan it was...

    minimum of 91 octane. Here in connecticut i usually run 93. I would not put anything less than91 in. THe owners manual should say so.


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    Official ClubWRX arms dealer SOUTHPAW's Avatar
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    Quote Originally Posted by mucky
    Does the WRX need premium gas. I thought engines with high compression ratios (10:1 and up) only benefit from the higher octane.

    Thanks,
    Matt


    So do turbocharged non-diesels. Turbochargers force more air into the combustion chambers which means you require higher octane to prevent uncontrolled combustion which = detonation.


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    Yes the fuel door says it, but I didn't notice it until I started to pump the 87 octane. my old cars used to have it in the guage cluster. Premium it is.
    Thanks everybody

  8. #7
    Moderator GV27's Avatar
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    Quote Originally Posted by mucky
    Does the WRX need premium gas. I thought engines with high compression ratios (10:1 and up) only benefit from the higher octane.

    Thanks,
    Matt
    The WRX has low static compression, high dynamic compression.
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