Good idea if you wish to upgrade. Much nicer ride than a W126. I made the change 6 months ago.

AC evaps are known to fail which is a big job. Door assist air compressors sometimes need adjustment or replacement. Fuel level sending units break.

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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