My 1990 560SEL lower guides looked good when I changed them at 170,000. They look like a different material and age differently than the top ones. One of the uppers was broken and ready to fall into the sprocket.

Ditmire is about 90 miles south of NYC. Lower cost of living. Bought one car from Bill, would have bought more but the terms and availability would change. Believe the techs are good. They serviced my SDL for two earlier owners and wrote repair notes in the trans pan and on the climate control

Another shop is Nick, German Automotive, Tinton Falls, NJ. Excellent and easy to deal with

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Present
1987 300SDL
1991 300SL
1990 560SEL
2001 ML320

Past
1969 200D 1979-82
1983 300SD 1984-85
1972 250C 1982-02
1995 S350 2011
1997 S320 2012