Best to steam clean the engine and transmission, then purchase a leak detector dye thats added to the oil. The dye glows when a black light is shown onto the area. A leak covers the engine with residue making it hard to locate the source. Having it on a lift or alignment rack makes it easier to do the search.

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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.