Motor oil weight.

[moparmarks]

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.

 

[toolmanmike]

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

 

[S'cuder]

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.

 

[Garrett Ellison]

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.

 

[318willrun]

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,***

 

[moparmarks]

Thanks guys.

 

[RustyRatRod]

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.