thanks for all the good advice. ill probably do it this weekend. is it necessary to replace the gasket between the intake manifold and the connecting air pipe? or can i put that off. does anyone know the part number for it?

thanks

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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