Who can help me with this one? 1982 Euro 280E. Starts and runs then black smoke from exhaust ! The plugs get black sooty deposits. Distributer suffers as well, but after cleaning, the car runs fine for a few minutes till the black smoke returns. Its obvious that fuel isn't being burned. If it was oil the smoke would be whitish. Does any kind hearted knowledgeable Mercedes man have an idea whats afoot here?