1. 4geardemon

    4geardemon Well-Known Member

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    I have a 318 in my Demon that has a tired bottom end. Lacks oil pressure when it is warmed up at an idle. Holds 25 lbs at the least running down the highway. I am in the process of building a 440 for it but am not pulling the 318 until it blows or the 440 is ready. Right now I run 10-40 Valvoline in it. Has anyone ran diesel oil in a gas motor? Like Rotella 15-40 or other brands? Just trying to extend the life of it so I can keep driving the car till motor is built.
     
  2. mguner

    mguner How many is too many?

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    I run 15w-40 diesel blend from Motorcraft.
     
  3. inertia

    inertia Well-Known Member

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    Run 20/50.
     
  4. 71DodgeDemon340

    71DodgeDemon340 FABO Gold Member FABO Gold Member

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    Depends on your climate. If in weather say 60 degrees and above 15w-40 or 20w-50 should be fine
     
  5. Motopsycho

    Motopsycho duster domination

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    lucas oil
     
  6. mguner

    mguner How many is too many?

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    Just make sure it has the proper additives to keep that flat tappet cam alive!
     
  7. 318willrun

    318willrun Utube channel 318willrun

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    you'll never install that 440...... 'cause that 318 ain't blowin' up... just say'n
     
  8. Breadburner

    Breadburner Well-Known Member

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    Straight 30.....
     
  9. 4geardemon

    4geardemon Well-Known Member

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    What additives need to be there for a hydraulic purple stick? When the 440 is built the 318 is coming out no matter what. Lol. I don't want to run expensive oil since it isn't anything totally powerful or special like a race motor and what not.
     
  10. MOPARMITCH

    MOPARMITCH Mekong Gold Member FABO Gold Member

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    Zinc !!
     
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    • MrJLR

      MrJLR Built, not bought FABO Gold Member

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      x2
       
    • MOPARMITCH

      MOPARMITCH Mekong Gold Member FABO Gold Member

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      Or 40
       
    • 4geardemon

      4geardemon Well-Known Member

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      Thanks all! I got 15-40. Big old brain fart on my part for the zinc. Put too much thought into it. Haha.
       
    • WildCat

      WildCat Well-Known Member

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      When they took the zinc out of passenger car oils many starting using the diesel oil since it still had it, but I believe they have taken it out of them also

      In a tired old 318 in warmer weather straight weight oil might be best. The 15w40 diesel oils would be good and in warm weather 20/50 would be ok also

      Really if it carries oil pressure at idle, 2-5 lbs would be ok as long as the lifters don't start rattling you have enough oil getting everywhere

      In the new engine you will want to make sure you use a zinc additive or a racing oil with it, unless you have a roller cam and rockers
       
    • Breadburner

      Breadburner Well-Known Member

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      Look at Brad Penn for your new 440.....
       
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      • GEO

        GEO Sarcasm Inc.

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        15w50 Mobil-1 has the zinc for flat tappet cams
         
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        • 71DodgeDemon340

          71DodgeDemon340 FABO Gold Member FABO Gold Member

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          X2^
           
        • Al Bundy

          Al Bundy four touchdowns!

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          I always used Valvoline Vr-1 racing oil,it has the zdddp our older engines need. It's a Dino oil to,so no need to worry about it cause old seals to leak
           
        • 66fs

          66fs FABO Gold Member FABO Gold Member

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          Give Straight 30 or 40 or 20w50 Valvoline racing a try. Should get you another 5 or 10 psi cruising.
           
        • jfleming64dart

          jfleming64dart Well-Known Member

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          I'll say this though, oil weight may not do jack if things are too worn out in the bottom end. My girlfriend's father has a '68 Ford Galaxie he lefts lets me drive, which used to bottom out near 0 oil pressure at red lights. I know its not a mopar engine but my point is: new oil pump, no leaks, and we tried 20w50: got us up to about 5 PSI at the red lights. We live with it, but I'm just saying viscosity won't always make too much difference.
           
        • 66fs

          66fs FABO Gold Member FABO Gold Member

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          Just a band aid till he gets his new motor done.
           
        • mech1nxh

          mech1nxh CUSTOM TITLE FABO Gold Member

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          Lol (at Myself) I had to do this 'band aid' thing once.

          I used 3 QT's of Delo 400 & 3 QT's of Cevron 80-90 wt Gear oil.

          LOL, sometimes 2k more miles takes the pressure of a limited budget :D
           
        • BigBlockMopar

          BigBlockMopar BigBlockMember

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          20w50 or even Gear oil works fine in an old worn engine struggling for oilpressure.
          If the engine is bone stock (cam/spring), then zinc-additive is irrelevant at this point.
          As long as there some hydraulic film or fluid pressure between the bearings, it will live.
           
        • toolmanmike

          toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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          X2 at this point, any thick oil will do the trick. You don't need to be fussy.
           
        • j par

          j par Well-hung Member

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          Torco 10 - 30
           
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