Regular Grade Fuel
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Cadillac XLR Forum Discussion, Regular Grade Fuel in Past Cadillac Vehicle Discussion; What about using 87 octane fuel? Any experience out there? Don't tell me I'm cheap -- I know that! Saving ...
  1. #1
    guysfun is offline Cadillac Owners Member
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    Regular Grade Fuel

    What about using 87 octane fuel? Any experience out there? Don't tell me I'm cheap -- I know that! Saving money is how I was able to afford this thing in the first place.

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  3. #2
    Playdrv4me's Avatar
    Playdrv4me is offline Cadillac Owners 10000+ Posts
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    Re: Regular Grade Fuel

    Many people have reported successful use of 87 octane fuel in past Northstars (post 2000), but to be totally honest with you, I havent seen many using it on the newest ones. The Northstar engine is a complicated and technologically advanced powertrain and I tell you what, if I could afford an XLR... 87 octane gas would not go in it...

    Just my opinion but... "Use at Own Risk" comes to mind.

  4. #3
    lundperformance is offline Cadillac Owners Member
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    Re: Regular Grade Fuel

    Modern engines have the ability to adapt to lower grade fuel because of knock sensors and VVT. They just retard the timing until your low grade fuel stops pinging. You're just lowering the performance potential of the engine by using lower grade fuel as retarded timing = lower performance.

  5. #4
    Playdrv4me's Avatar
    Playdrv4me is offline Cadillac Owners 10000+ Posts
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    Re: Regular Grade Fuel

    Still... the manufacturer does not put a premium fuel requirement in the manual just for the hell of it. In fact, this is more to their disadvantage as some might not consider it with the high cost of fuel. Like anything else, Im sure its ok, but over the long term could have implications. Even when Ive been made fun of by friends and co-workers for putting cheaper fuel in expensive cars that I have purchased used, its STILL at least MID-Grade. In other words, its really kind of silly to put cheap gas in a 70k car, especially if your in it for the long haul.

  6. #5
    jmm1876763 is offline Cadillac Owners Member
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    Re: Regular Grade Fuel

    Folks you are disrespecting the XLR you should use "91 and only "91 and your car will always run find. Thanks

  7. #6
    Playdrv4me's Avatar
    Playdrv4me is offline Cadillac Owners 10000+ Posts
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    Re: Regular Grade Fuel

    Amen to that brother. I say dont go with the cheap stuff, its not like it makes a huge difference in cost anyway.

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