Also, I would inspect your chain guide rails. They start life as a light cream colour.. If they are looking Dark brown it's most likely time. Also, your cam tower oiler tube clips. They start life as a medium brown but with age they almost turn black. 8$ part that can eat $$$ worth of cam/towers.

Have heads ever been done on your car? Ever take a compression test? By 200K stock valve guides are toast.

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta