Which oil

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MoparMcK

MoparMcK

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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.
 
Depends on your climate. If in weather say 60 degrees and above 15w-40 or 20w-50 should be fine
 
Just make sure it has the proper additives to keep that flat tappet cam alive!
 
you'll never install that 440...... 'cause that 318 ain't blowin' up... just say'n
 
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.
 
4geardemon said:
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.
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Zinc !!
 
Thanks all! I got 15-40. Big old brain fart on my part for the zinc. Put too much thought into it. Haha.
 
4geardemon said:
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.
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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
 
mguner said:
Just make sure it has the proper additives to keep that flat tappet cam alive!
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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
 
Give Straight 30 or 40 or 20w50 Valvoline racing a try. Should get you another 5 or 10 psi cruising.
 
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.
 
jfleming64dart said:
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.
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Just a band aid till he gets his new motor done.
 
66fs said:
Just a band aid till he gets his new motor done.
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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
 
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.
 
BigBlockMopar said:
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.
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X2 at this point, any thick oil will do the trick. You don't need to be fussy.
 
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