Wait til you swamp it and the motor fills up with water. Your oil pressure will come right down...lol.
Ive never been around the 4 bangers but the 4.0s vary widely. I just dont worry about it unless they start getting down to 20 or lower. Mine isnt a dd though so if it dies it dont matter much except I dont get to wheel til I fix it...
91 Laredo, 4.0ho, TF999, Magnaflow exhaust, Yukon rear axles, Spartan Lockers, Posi locker, 3.5 inch springs, 1"MML, 1"BL, 1"shackles, trimmed fenders, raised flares, 35x13.50s.