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What octane fuel

Discussion in 'Ram Trucks' started by RoseMan806, Dec 4, 2012.

  1. RoseMan806

    RoseMan806 Member
    Messages: 96

    My 2005 Ram 2500 calls for 89 but states its is ok to run 87. Just curious what everyone is fueling up with when plowing.
  2. cubicinches

    cubicinches PlowSite.com Addict
    Messages: 1,415

    Diesel... :D
  3. RoseMan806

    RoseMan806 Member
    Messages: 96

    That's my next truck.
  4. mnglocker

    mnglocker Senior Member
    Messages: 923

    Just run 89. If it's what it calls for and you run 87, it'll just ****** the timing and cost you some power/efficiency.

    DAFFMOBILEWASH PlowSite.com Addict
    Messages: 1,602

    #2 diesel w/ cold weather additives

    As for the gassers don't forget some fuel antifreeze, the cold weather will be here before you know it. Yes I have run 87. In the heavy wet snow 94 would never hurt.
  6. theholycow

    theholycow PlowSite.com Addict
    Messages: 1,180

    ^What he said. 87 won't damage anything but you'll give up a little bit until you get your tank up to 89 again.
    These days gas comes with 10% ethanol anyway...and the most popular fuel antifreeze, "HEET", is just a bottle of ethanol after all. If you need more than 10% ethanol then you have a LOT of water in your tank.

    It won't hurt, but neither will it help (unless you've done modifications that call for it or the manufacturer lied about their recommendation and really designed it to run on 94).
  7. plowguy43

    plowguy43 PlowSite Fanatic
    Messages: 5,281

    Just run the 87, the HEMI won't care either way.
  8. nhglock17

    nhglock17 Member
    from nh
    Messages: 59

    I have a 2012 Ram 2500 and I only run 87 octane.I nevr had a problem runs fine,David
  9. blueline38

    blueline38 Senior Member
    Messages: 436

    91 octane, zero ethanol!
  10. RoseMan806

    RoseMan806 Member
    Messages: 96

    So it looks like I'll be running 89 when plowing. Thanks for the response.
  11. Laszlo Almasi

    Laszlo Almasi Senior Member
    Messages: 326

    Premium non ethanol fuel only!!

    Unless I can't find it. Then I just run premium until I can get back to nonethanol.

    All that until I drop my 6.7 Cummins into it. Then it'll be diesel only. :^) Got the engine and tranny already...just need the time to make it happen.
  12. Ram 08

    Ram 08 Member
    Messages: 53

    My manual states the engine was designed for optimum performance with fuel octane in the range of 87 to 89, and they recommend 89. They then discuss spark knock as a result of lower octanes. I have always run 89 and still occaisionally hear a little spark knock.
  13. Laszlo Almasi

    Laszlo Almasi Senior Member
    Messages: 326

    I run the higher octane because I have a Superchip program on my ECU. Try running one tank of non-e in your truck and see if it knocks as much as before. And if you switch to a higher octane, most likely the knock will be gone completely.

    Unless your intake plenum has failed miserably like mine did years ago and you fixed it with the Hughes plate. But I think the Hemis don't have that problem.