Since it's a sedan, I'd say it's a $9-10k car. If it was a CD or TD it would possibly be $12-15k, imo.

It oooks to me like it may be a repaint. It is missing some stickers underhood, and certain parts look somewhat worn. Not trying to accuse, just giving honest feedback since others may ask or think similarly.

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)