Mine was leaking badly at 54k miles. No other signs, but I replaced it anway. I felt that I was going to have to do it eventually. I would like to ask the same question for the wiring harness on these models. How long have you gone before having a problem with them? Or is this not a sure a thing as the head gasket going out?
1994 C 280 117.5k, White (Good as new)
1997 Toyota Camry 149k Miles (Not so pretty anymore)
1990 190e 2.6 95k (Sold-Should not have)
1981 240d Stick ??? Miles...sold