Blue smoke is worn out valve guide seals. Takes a few hours to do, but it will cure the smoke on takeoff and after idling problem.

BLACK smoke, on the other hand, is too much fuel. However, you will fail the CO test with too much fuel, so I suspect bad valve guide seals.

You have the right milage for them to be bad. Not horribly expensive, and it will decrease oil usage to about zero.

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!