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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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