Corby:

Actually, intake valve stems are smaller diameter and the exhaust run much hotter -- these are sodium filled valve stems on the exhaust!

Make sure you get the new seals completely pushed down over the boss -- MB has a special tool (of course!) but you can use a big screwdiver, flat side, to push them down. Fairly stiff spring, but if they aren't all the way down, they don't work!

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!