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 - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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