Grade gas?

Discussion in 'Dodge Challenger General Discussions' started by NinjaMom, Dec 26, 2012.

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  1. Dec 30, 2012 at 11:58 PM #11
    NinjaMom

    NinjaMom Member

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    My challenger is a 2013 5.7 manual.... so I have to have 91 or higher, but the salesman. ... and dealership for that matter didn't realize it and was putting 87 in it. :confused:

    The manual says regular is fine for the 5.7 auto. Wonder why they are different.
     
    Last edited: Dec 31, 2012
  2. Apr 24, 2013 at 2:24 AM #12
    Model maker

    Model maker Full Access Member

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    Great question I an going to take delivery on my 2013 R/T soon. I want to know what is best for it. It is a automatic auto stick with paddle shifters.
     
  3. Apr 24, 2013 at 7:26 AM #13
    Storm Rider

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    The manual for the 2010 says to use 89 for the 5.7L. I run 93 in mine. The dealership says that there is no advantage to using a higher grade fuel. Mine is a weekend driver so I use the higher octane.
     
  4. Apr 25, 2013 at 11:55 AM #14
    SRT-Tom

    SRT-Tom Well-Known Member Staff Member Super Moderator Article Writer

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    The manual recomends 91 premium octane in my 6.1. Haven't tried 93 because it runs great on 91.
     
    Last edited: Apr 25, 2013
  5. May 1, 2013 at 1:02 AM #15
    Model maker

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    My salesman who picked it up and brought it home 250 miles ran 89 mid grade and it runs great on that so that's what I will use. the book says 87 regular is fine but I want to go UP a grade to 89 as that's what is in the tank now and I have 1/4 th tank left & my dash display says I have 115 miles left on that 1/4 th tank.
    Bert
     
  6. May 30, 2013 at 3:26 PM #16
    DTru

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    For auto RT's the manual states that you can use 87 but 89 is recommended. For manual RT's 91+ is required.

    I dont know about SRT's.

    If you put lower grade in it will not hurt the engine, like others have stated it will just retard timing and decrease performance.

    I have played around checking out different gas stations and grades and logging my findings with the trinity.

    93
    When in drive, without manual shift or sport mode, I would get up to 5.5 ST and 1 LT Knock Retard. Using Chevron gas and manual shift mode the highest I have seen is 1 ST.

    91
    When in drive, without manual shift or sport mode, I would get up to 5.5 ST and 2 LT Knock Retard. In manual shift mode it would get up to 4 ST with 0 LT.
     
  7. Jun 24, 2013 at 12:19 AM #17
    Model maker

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    My manual says in the fluids section that 5.7 needs 91 octane. it doesn't mention automatic or manual. I have to reread the thing because I no I saw it was ok to run 89, now I can't find that part. I haven't looked at the DVD that came with the owners manual but I think it may have more information.
     
  8. Jun 24, 2013 at 7:15 AM #18
    Storm Rider

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    The manual for the 2010 says you can use 89 octane or mid grade. I run 93 in mine.
     
  9. Jun 24, 2013 at 8:28 AM #19
    DTru

    DTru Member

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    Thats the user guide not the manual. If you check the actual owners manual it will tell you the difference between auto and stick.
     
  10. Jun 25, 2013 at 10:23 PM #20
    RT_6Speed

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    The manual trans cars are slightly higher compression than the auto cars. Some sites list dual specs for the 2010 R/T's as 370hp/398tq for the auto and 375hp/404tq for the manual cars. Could be due to the slight difference in compression rations and/or tuning.
     
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