I bought a 93 4 cyl with only 75k on the odometer after my car got stolen.
Crawled under and gave it a good look-over, saw the usual signs of oil seepage but
no drips on the driveway under it or big drops hanging anywhere. Well, the driveway
was pretty steeply sloped and it was front down.
When I got home I changed oil, parked it on the level, and had a 3' diameter puddle
under it the next AM. Thought rear main.
Only way to check is to pull the trans. I broke down and bought a manual $65 trans
jack from Harbor Freight and it made the job just about simple. Truck was up on jack stands.
Wasn't the rear main. I think somebody had maybe messed with it, but there was about
3/16" or close to that gap between the bottom of the rear main seal retainer and the
top of the oil pan flange.
I am 1700 miles from home and don't have enuf equipment to pull the motor, and needed
the truck ASAP anyway as it was by then too cold in the AM (20's) to ride my bike the 40 miles to work.
Used a can of carb spray to clean the oil out of the gap, let enuf out of the pan so it was below the leak point, sprayed it several times and dried the gap with canned computer air as I don't have a compressor here. Used hi temp silicone and pushed it into the gap good, let it dry, then put another layer over the top. That was 2,000k ago and no more leaks. Fingers crossed!