With the air filter lid off, spray WD 40 into the intake while someone cranks the engine. Most times after 2 or 3 short bursts of engine running, it will fill the see thru filter on its own. Dont crank too long, weakens battery quickly and can overheat the starter.

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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.