I think this might be something worth having for a W140.

The mechanic I went to this summer told me the W140 (which includes the 600SEL) has 32 or 33 fault codes. It is a complex automobile. The W126 I think he said has just 10.

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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...

1995 E 420, 170k "The Red Plum" (sold)

2015 BMW 535i xdrive awd Stage 1 DINAN, 6k, <----364 hp

1967 Mercury Cougar, 49k

2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive (sold)