When my 1990 W124 300D sedan started leaking oil from the air filter, the cause was traced to an electronic gizmo that was defective. The oil would drip out of the air filter housing and drip on the louvers under the grille, where the bumper-hook cover panel is.


I don't know whetther a w123 has one, though.

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Semibodacious Transmogrifications a Specialty

1990 300D 2.5 Turbo sedan 171K (Rudolf)
1985 300D Turbo TD Wagon 219K (Remuda)

"Time flies like and arrow, yet fruit flies like a banana"
---Marx (Groucho)