I think I speak for everyone when I say that there is absolutely no apology necessary. We are all just chatting over your problem.
From what you just said, I feel pretty sure that all you need is the upper cover removed, resealed and replaced. This is a common source of leaks on this engine. Unless it is leaking bad enough to puddle the garage floor underneath it, it's not a burnine necessity to repair it right away.
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in