Oil pan leaks are very common. Most times it is because of pan bolts loosening because of gasket compression, sometimes just snugging them up will help. I hope I don't have to that also in the future on this engine. When I was a kid, and the pan leaked it was easy job to replace the gasket. Of course that was a time when cars were made to work on.
I think the next time I have to do any engine work to this van I will rig up a body hoist so the sub frame can be unbolted and separated from the engine. The next job will be the timing belt, I cannot do it right now because of money and time restraints, but the mileage of the vehicle dictates it should be done soon. I don't know yet if it can be done in the compartment.
Well, now I have to go out and clean all the mating surfaces, drill and easy out a broken exhaust stud, and start putting it back together. I do not have the money right now to have the heads done, so I will have to have some faith that it will be OK. The rear exhaust manifold is the pain, you cannot see what you are doing.....Valium here I come!