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Another Oil Question

Discussion in 'Early CJ5 and CJ6 Tech' started by haighfam, Jul 18, 2017.

  1. haighfam

    haighfam Member

    I've done the search and have settled on Shell Rotella F1 straight 40wt. It's hard to find, Tractor Supply is the only source near me. I can find the Rotella F4 15w40 everywhere. Benefits or drawbacks to either one. I'm changing the oil pan gasket so now is the time to change oil. Was running Castrol 10w40. Want to switch to a diesel oil as suggested for the flat tappets.
     
    haighfam, Jul 18, 2017
    #1
  2. Glenn

    Glenn Kinda grumpy old man Staff Member

    I prefer 15w40 since it flows a little better when cold.
     
    Glenn, Jul 18, 2017
    #2
  3. djcj3a

    djcj3a Member

    The new CK4 diesel oil isn't much different than any of the other automotive oils nowadays. If you're worried about your flat tappets, you would be better off running a break in additive every oil change than trusting the new diesel oils.
     
    djcj3a, Jul 19, 2017
    #3
  4. Tom_Hartz

    Tom_Hartz Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    I run Racing Valvoline 10/30 for the high zinc content.
     
    Tom_Hartz, Jul 19, 2017
    #4
  5. PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    PeteL, Jul 19, 2017
    #5
  6. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    I think you'll be fine with the 15W-40.

    We can argue oil all day but Rotella has a good reputation for the zinc/tappet issues and is at the very least known amongst all sorts of people who run old engines *not* to do any harm to them.

    H.
     
    Howard Eisenhauer, Jul 19, 2017
    #6
  7. montanacj

    montanacj Member

    It seems like you can run rotella in pretty much anything. That Valvoline racing oil isn't a bad idea either.
     
    montanacj, Jul 19, 2017
    #7
  8. Glenn

    Glenn Kinda grumpy old man Staff Member

    Rotella diesel or Valvoline diesel for us.
     
    Glenn, Jul 19, 2017
    #8