Just saw the detailed thread about the vacuum pump failure in a NA 606 earlier this week. I thought about replacing mine as a preventive until I read about the different rotary design in the later cars. Is it true that the 98/99 vac pump is sealed and no danger of grenading the engine? I have a slight mid-range "rattle" that I can't attribute to the belt shock, injectors, air bubbles, or other culprits so I wanted to rule this out.

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1982 300D-T (sold)
1988 300E (sold)
1994 E320 Wagon (sold)
1995 E320
1998 E300D-T
1999 E3204M Wagon
2001 E320
2005 E320 CDI