Welcome to the MB diesel gang. Those previous posts are right on the money.
After having your valves adjusted I would invest in some RedLine Diesel Fuel Catalyst. You can usually pick it up at the local PepBoyz. You don't need alot but I would start with 1 full bottle for your first couple of fillups. I firmly believe that you will notice a substantial decrease in your smoke. Also you should notice an increase in power.
All of the diesels do have the built in James Bond smoke screen feature. It's perfect when on the expressway and the guy in the convertible is on your tail. Just slow enough to let him get a good whiff of the diesel and then....floor it. He will get the James Bond smoke screen and you wont have to worry about him tailgating you again. hehe
84 500SEL EURO 101K ( JUST LIKE MY 1ST WIFE. GLAD TO GET RID OF HER! )
85 300D 310K (sold)
90 350SDL 184K sold
83 300D 118K (sold)
88 300E 153k (sold)
93 400E 105K (sold)