Steve, I'd hope that an oil pressure issue / worn bearing (!!!) issue would have reared it's ugly head after 10 months, especiallly after track use, etc. It's an intermittent issue as well, not a typical sign of bearing wear.
Interesting, though. MB Doc, not that I am doubting your opinion, at ALL, but I am still receiving conflicting info on this issue. Another, separate MB tech I just spoke with says he's actually seen SOME US 2.3-16's with the hydro's. Mine's an '87. Is this possible?
Regardless, I've ordered the new gasket and plan to yank the cover in the next week for a 1st hand peek. Mystery will be solved!
Again, many thanks to you both and any others that feel they may be able to help!