A drip every minute or two will be at least a quart in 800 miles. Find the leak and fix it before getting excited about oil consumption. After all, the 220D usually eats a quart in a quarter tank..... Most usual places are leaking valve cover gasket (easy fix), leaking blowby tube, or misc. dribbles from leaking chain guide covers, etc. There are several bolts that go into the chain case up front, and if they dont' have sealant on them, leak oil out.

A diesel will consume massive quantities of oil before it shows blue smoke -- usually only see blue on startup with bad valve guides or guide seals, or if the turbo seals are shot and you are blowing oil down the exhaust pipe, or if the vac pump diaphram is holed, and then only at idle.

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!