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If the valves aren't too bad, they can be ground and the valve seats resurfaced, but usually by the time MB valves leak, they are so worn that they need to be replaced. Valve guides are usually worn by this time, too, so the head comes off and you do all of it at once.
Not cheap, sadly, but if you have less than 250,000 miles on it and the valve guides aren't worn, new seals will fix you right up. I've seen it any number of times -- oil consumption goes from a quart in a thousand miles to zip, no more blue smoke on startup.
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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