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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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