Ok, '88 4.0 AX-15 MJ, So I replaced my valve cover last year with a steel one from a 97 ZJ and I used the plastic oil cap from that one, for the last couple of days I've noticed my oil pressure gauge fluctuating when I come off the gas where before it used to be a pretty steady 40 psi while warming up and 20 psi afterwards. I finally got some time to check the oil and it was below the add line, and it is time to do an oil change, but I do need to drive it some before I have the time to do that.
Ok, sorry for the extra details, the filler cap is stuck on, it ratchets if I try to loosen or tighten it, I've read about replacements from NAPA, Advance etc.. but before I destroy the old one, is it possible to add some oil through the dip stick tube, I don't see any reason why not, but just want to check with the knowledge bank here before making my problem worse.
TIA
Karl