Please accept my apologies gentelmen. I had a heck of a week. Here are responses to all of you in no paricular order. I will have to probably do multiple posts due to the number of pics.
psfred:
I checked the oil filler cap and it looks fine. There is no visible sign of oil leaking from there. I have a spare oil filler cap that I bought from the Mercedes dealer for my W201 2.3 8v. It has approximately 20,000 miles on it. Is it the same as the W124 cap? I was thinking of replacing it anyway with this one. Here are pics:
Part # 111 018 03 02 REUTTER
Should I replace it with one?