http://v12uberalles.com/

Site has great info on the common W140 troubles, plus repairs and tips on the V12 engine.

By the way i think you got a steal on your 600SEL. Its a very nice car and the upgrades done to it by the previous owner make it all the more better. Gas mileage must be a pain though!

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Current:
05 E320 CDI
07 GL320 CDI
08 Sprinter
05 Dodge Cummins
01 Dodge Cummins

Previous
2004 E55 AMG
2002 C32 AMG (#2)
1995 E300
1978 300D
1987 300D
2002 C32 AMG(blown motor :[
1981 300SD
1983 300SD
1987 300SDL
2002 Jetta TDI
1996 S420
1995 S500
1993 190E 2.6
1992 190E 2.3
1985 190E 2.3 5-Speed