these cars have some of the same problems as the 606.962 (i.e. stuck glow plugs, fuel leaks etc) The motor itself is problem free but the W211's did have a recall on the SBC wiring harness. Make sure this has been done. This car is not really DIY friendly as it requires SDS to diagnose and reset a lot of the electronics.

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2005 SL65
1999 E300
1995 E300
1994 SL320
1988 560SL
1987 300TD
1982 300D
1955 300SL