From MY experience with a Jeep 4.0 six, be VERY wary of using thicker oil to increase the oil pressure. In my '88 Jeep Comanche pickup, I decided to "help" the oil pressure by switching to straight SAE-30 high-detergent Havoline motor oil a few years back. After the oil change, the oil pressure was reluctant to pick up enough to turn out the light, and by the time it did [15-30 seconds, according to the lube rack guy at the dealership where I worked] the engine had a rod knocking. The oil pump was shot, and apparently the heavier oil finished it off. Cost me a crank kit, an oil pump, a lower gasket set, and with 60k miles on the odometer, I also replaced the timing chain set [no nylon gears for me, thank you].
So if it was me, based upon my experience with the 4.0, I'd assume the oil pump was on the way out [if you've never replaced one on that engine before], and start looking for a replacement vehicle if you don't want to dig deep to fix this one.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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