Motor oil weight.

Magnum Engine Swaps

  1. moparmarks

    moparmarks zippindippintie FABO Gold Member

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    Hi gang.
    I have a 2002 5.9 in my Dart. Don't know much about the motor. Bought it from a customer after I took it out of a 71 Cuda. Seems to be around 350 hp.
    What weight oil are you running in your HP Magnum motor? In my 60-70's motors I run 15-40 Rotella but have been running 5-30 in my stock Magnums trucks and have over 300k on them. I was thinking maybe 5-40 in the Dart.
     
  2. toolmanmike

    toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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    10/30 anything in a Magnum. It's a roller cam engine so you don't need a lot of zddp
     
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    • S'cuder

      S'cuder FABO Gold Member FABO Gold Member

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      10 PSI per 1000 RPM is a good rule of thumb. If you are significantly away from that, try lighter or heavier based on the number after the W, which represents the grade when fully warmed up.
       
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      • Garrett Ellison

        Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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        Right on with all answers, I'm partial to an upgrade from 5-30 to 10-30 after 50,000 miles or for high performance applications. A blue bottle of STP won't hurt anything in this instance if you want a little extra insurance, but isn't mandatory. I've always been a pretty big proponent of "Stay Together, Please" myself, though.
         
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        • 318willrun

          318willrun Utube channel 318willrun

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          Not high performance, but I've always ran 10w-30 in the summer and 5w-30 in the winter on all my magnums. No issues ever, most high mileage including my ram now at 280,XXX
           
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          • moparmarks

            moparmarks zippindippintie FABO Gold Member

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            Thanks guys.
             
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            • RustyRatRod

              RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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              I don't know where all the flurry of "use a different weight to get a different pressure" comments are comin from all of a sudden, but this is WRONG, WRONG, WRONG. If you're shuffling around different oil weights to try and change your oil pressure, you gotta PROBLEM somewhere else.
               
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