newbie here with a 1980 240D that just started exhausting a lot of blue smoke upon start-up which seems to get less when warmed up. Searching the forums here points to bad stem seals . I live in NYC and don't have a garage/expertise to do this. How much should I expect to pay an independent MB shop for this- I would also want the valves adjusted. Any expected range of cost would be helpful - also should I have them do a compression check first (car has about 180,000 miles and has been decently maintained); any other ideas on the blue smoke cause (does not appear to be a lot of blowby)