The local dealer would not replace the trap on my brother's car until it plugged. My indie mechanic (previous owner) verified with MB that no replacement was done until the trap failed or plugged, he tired several times. No cost, but a hassle.

This may be a dealer determination, but MB backed them, and we have no alternative here less than 50 miles away.

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!