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Blue puff of smoke after extended idling is diagnostic for bad valve guide seals/valve guides.
Was the place you had the work done familiar with MB valve guide clearances, or did they ream them to get a couple thousandths clearance? If so, there is your oil problem. MB valves usually won't go into the guide dry, they must be oiled, and clearance is less than 0.0005" cold with a new guidel
The other possibility is that the seals were damaged during installation, or not seated properly on the head, allowing oil to leak down.
Don't have any other ideas, alas!
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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