3.6 DI and fuel
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2008-2013 Cadillac CTS Performance Mods Discussion, 3.6 DI and fuel in Cadillac CTS Second Generation Forum - 2008-2013; Am I the only person that has found the 3.6 DI likes premium fuel better then midgrade? I have switched ...
  1. #1
    fl1cts is offline Cadillac Owners Member
    Automobile(s): CTS
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    3.6 DI and fuel

    Am I the only person that has found the 3.6 DI likes premium fuel better then midgrade?
    I have switched back and forth a couple of times and there is definitely a difference in the performance using the 93 octane vs 89.
    When using the 89 there is a hesitation when accelerating but when I use the 93 octane it's gone.
    Does anyone know the the real compression ratio of this engine?

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  3. #2
    WNBAMiamiSol is offline Cadillac Owners Fanatic
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    Re: 3.6 DI and fuel

    The issue I've had is with gas containing government mandated 10% ethanol. Twice I have had my engine warning light come on because I have gotten 'bad gas' aka gas with more than the 10% allowed ethanol. I can't believe Florida forces consumers to use gas containing ethanol. Aside from being bad for the environment, I find I get 2-3 mpg less using it. A station near me sells ethanol free gas called 'recreational' to get around Florida's mandate. They charge $3.29 a gallon as opposed to $2.69 a gallon for the crap containing ethanol. I wonder if anyone else has had this problem.

  4. #3
    fl1cts is offline Cadillac Owners Member
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    Thread Starter

    Re: 3.6 DI and fuel

    Quote Originally Posted by WNBAMiamiSol View Post
    The issue I've had is with gas containing government mandated 10% ethanol. Twice I have had my engine warning light come on because I have gotten 'bad gas' aka gas with more than the 10% allowed ethanol. I can't believe Florida forces consumers to use gas containing ethanol. Aside from being bad for the environment, I find I get 2-3 mpg less using it. A station near me sells ethanol free gas called 'recreational' to get around Florida's mandate. They charge $3.29 a gallon as opposed to $2.69 a gallon for the crap containing ethanol. I wonder if anyone else has had this problem.
    Interesting, more then 10% ethanol should only increase the octane level since it has a much higher octane then gasoline.
    But it will decrease mileage because of it's stoich rate. ~6-1 vs 14.5-1
    BTW, Florida is not the only state all 50 have the ethanol mandate since it was Federal a few years ago.
    Are you using "top tier fuel"? That's all I use and the real issue I've found is performance, it's like the car is holding back for a second when increasing throttle with 89 octane.

  5. #4
    Bandit1's Avatar
    Bandit1 is offline Cadillac Owners Fanatic
    Automobile(s): CTS 3.6DI
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    Re: 3.6 DI and fuel

    Quote Originally Posted by fl1cts View Post
    Am I the only person that has found the 3.6 DI likes premium fuel better then midgrade?
    I have switched back and forth a couple of times and there is definitely a difference in the performance using the 93 octane vs 89.
    When using the 89 there is a hesitation when accelerating but when I use the 93 octane it's gone.
    Does anyone know the the real compression ratio of this engine?
    Me too. Experimented between the two grades.....three tanks per grade. Found the hesitation was gone, acceleration and idle seemed to be smoother, and I picked up 1mpg in combined city/hwy driving with the 93. I think I'll stick with it.

  6. #5
    beanjapan's Avatar
    beanjapan is offline Cadillac Owners Fanatic
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    Re: 3.6 DI and fuel

    The owners manual recommends 89 octane for peak performance.

  7. #6
    Bandit1's Avatar
    Bandit1 is offline Cadillac Owners Fanatic
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    Re: 3.6 DI and fuel

    Quote Originally Posted by beanjapan View Post
    The owners manual recommends 89 octane for peak performance.
    Yes it does. And......?

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