I've got a 93 Grand LTD - shes got 212000 on her, and I've got this problem with a huge swing in oil pressure. When you 1st start it, at idle, she's fine. Give her some rpm's and as the rpm's get higher - the oil pressure gauge will peak at 80psi, and come back to 50/60psi for idle. After shes warmed up - Idle shows 20psi and rpms will get her into the 50's consistantly. Is it time for a new pump, gauge or sensor?
Also - got seeping oil from the oil filter? No matter what I do - can't get it to seal - it is possible to replace only the area where the oil filter screws onto the block? Looks like is should come off - but can't get my big fat head in close enough to see!