With the number of W210s you now own, it's time you got the service DVD from Mercedes.

Unlike BMW, Mercedes is quite willing and happy to provide lots of information on servicing its cars.

The DVD contains repair procedures, service bulletins, dealer technical bulletins, electrical diagrams, videos of various procedures, etc. When special tools are required, there's an illustration of the tool and its part number is indicated--you can order the tools from your dealer and several other sources.

Dealer or 1.800.for.merc for the DVD.

You can supplement this with a $20/year subscription to the Electronic Parts Catalog, which provides illustrated parts breakdowns and part numbers.
http://www.startekinfo.com/epc/welcome.jsp

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles