Hi all thanks for your time,
i have a 2000 4.0 that has a interesting problem, with oil pressure. When i start up the jeep in the monrning I get about 50psi on and then it settles down to 40psi. The issue is that i drove from Springfield to Osage Beach and had to stop at Lebanon when my check engine light came on and my oil pressure was between 0-5psi. i turned the engine off and waited 20 mins and checked the oil, there wasnt enough oil to show up on the dipstick. I walked to gas station and bought all the 10w-30 they had which was 5 quarts. I then continued on to osage beach, where i checked the oil level the next day and was 1 quart low. I put one quart in it. Drove back to Springfield, got to strafford and the pressure starts dropping, drastically. I did make it home, checked the oil level and same thing as above, almost none. I have sense changed my oil with 10w-30 and Wix filter. Other than the obvious problem, i dont have a single spot on my garage floor. I didnt find any milkiness in the oil and no signs of oil in the coolant. Also the jeep doesnt smoke while it running or smoke when it starts.
I have found several issues with 0331 heads that are cracking, but that usally points to a leak with coolant in the oil. i thought it might be cam bearings but it not just pressure im loosing oil some where/some how.
sorry for the ramble, thanks for your time.
