One of my engines overheated a few weeks ago after the raw water intake got clogged. Afterwards I noticed lots of engine oil in the bilge and the level was low. After fixing the clog and adding oil, I ran the engine and it doesn't appear to be leaking oil anymore - sort of hard to tell as the bilge is a mess. I cleaned up most of the oil using cat litter, but it's still pretty oily. No water in the crankcase either, so I don't think the head is cracked.
Could the oil of come from the rear main seal, and if so has it really stopped? Where else could the oil come from?