I recently repaired a 4 cyl yj. the guy was concerned of the oil leaking out of the dip stick, so he plugged the dipstick with a rubber grommet and a hose clamp. it then started to leak from the drain plug and filter, when I looked at it, I tried to blow air in his pcv hose and found that it was clogged. severe carbon build up, I unclogged the plastic hose and waalaaa! no mas oil leak. check your pcv hose on top of the valve cover.... couldn't hurt to check

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88 YJ, 4.2L, WEBER 32/36, On 33" Dunlop Mud Terrain, 4.10 ratio, tru-trac locker in dana 35...