yeah, thats why i let go after only a couple minutes. i was afraid i was going to hear a POP! and then a hiss of some kind if i kept holding the vent closed.

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1991 300 D 2.5 Turbo, 220k
also in the family:
1981 240 D 185k
1991 350 SD 185k
2006 S 500
2005 SLK 350