Well in fixing up my 03 e with 215k i recently bought, it has apretty serious oil leak. Upon inspection, i cleaned the bottom of the oil pan with brake cleaner, started the engine and waited for the oil to show itself. Unlike most cars its not leaking from a seal or gasket or something easy. Its must have pin holes in the bottom of the actual pan. It is pretty rusty. So i have to replacing the pan....do not try this yourself. I had to undo 2 motor mounts, stripped 5 oil pan bolts, and i used my excavator to pull the engine out just for enough clearance to drop the pan. All in all it took about 5 hours. The good news is that a new pan is only $46. I'l keep you posted on the reinstallation.