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Old 04-04-2014, 01:18 PM
Garrettbarnes96 Garrettbarnes96 is offline
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Join Date: Apr 03, 2014
Location: Sebring FL
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1985 jeep j10

My name is garrett and I have a 85 jeep j10 360. I was wondering if I could run straight 50w oil in the truck. When I start it up it has 50 oil pressure but when the motor gets warmed up at idle it reads zero. How do I get better oil pressure?
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Old 04-04-2014, 01:46 PM
joe joe is offline
 
Join Date: Apr 28, 2000
Location: PNWet, USA
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No straight 50w is too thick for the tolerances of an 85 AMC motor. Yeah 50w will make your gauge read higher but that don't guarantee that thick goop is getting into where it needs to be to do it's job. A multi-vis 20w-50 would be ok year round in FL.
Figure out why you have zero pressure at hot idle. Start with a mech gauge and compare the readings with stock. Stock gauges are famous for being inaccurate. If you're really getting zero at hot idle you'd be hearing some upper end rattle. Low pressure is likely timing cover wear where the pump gears runs, cam bearings severely worn or main bearings severely worn. Thicker oil just to get a warm-n-fuzzy feeling from the pressure gauge is a false sense of security. Fix the cause not the symptom.
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Old 04-04-2014, 05:19 PM
Garrettbarnes96 Garrettbarnes96 is offline
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85 jeep j10

Yesterday I was a quart down. I bought 50w and dumped in it I usually run 20w-50w. It has been making it run better. I have a problem with it shifting fast. When at a dead stop. It shifts at 10 then again at 15. Since I put that quart of 50w in it it has been running and driving smooth. It used to be a mud truck and I think the motor is worn down but when I got the truck the motor was strong so I kept it. The tranny was rebuilt a year ago.
Oh and I just put a new set of after market gauges in it.
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Old 04-08-2014, 10:51 PM
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Carnuck Carnuck is offline
 
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Location: Gold Bar, WA
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I ran my old truck on Napa synthetic straight 50W because it was burning oil. Stopped the burning and smoking too!
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