Volvo Repair: occasional exhaust smoke starting 90/240dl, worn piston rings, valve seals

Question
90 volvo 240dl with 141k. fair mech skills.
i have smoke comes out of exaust upon starting, since cold weather. after setting for about 3-5 days, this seems to happen fairly regularly. the smoke is white and is just for first 15 seconds then stops. once i have been driving, it doesn't reoccur unless it sits for another couple of days. runs well, idles well. had reg maint check sept and gave ok, just passed emission oct. ideas ?

Answer
Hello Aaron,
          Good choice of car...HMMMM...smoke out the tailpipe...only a couple of places that oil or anti-freeze can get into the cylinders.
        Look into radiator expansion tank...look for tell-tale signs of exhaust residue in this place...if yes....leaking head gasket.
          When the smoke happens....smell it...NOT a BIG sniff just a indication of what is being sent out the exhaust system.
            Check the inside of tail pipe...use paper towel...wipe the inside of tailpipe...see what it appears to be coating inside of pipe.
           Worn piston rings....or damaged will cause oil to go out pipe.....problems with valve seals could cause oil to go into cylinders...oil return ports in head allowing pressured oil to return to pan may be obstructed...causing oil to seep into cylinders.
             This info will keep you busy...searching for answers.............Good luck,

                               Bilbo