As said before many times: owening a 600 is the equivalent running costs of owening two 320s with the added hassle that almost any engine part is three to four times more difficult to acces than on a 320 due to space limitations ( = double or triple the hourly rate to change a part).

S 600s are rare and very nice, but you will be really hard pressed to notice the difference of driving an S 500. The M119 engines on 500s are tank proof and will last forever (they just have a few little things to look for, unlike the V12, which has many issues to be careful about).

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A. Rosich
CL 500, 1998
S 500 L, 1998
E 320 T, 1995 [Sadly sold ]