No doubt about it: if you want a relative realiable W140 you must go for the 1997-1998-1999 model years and preferable an S320 (the V8's are O.K. until they start giving problems, then hang on to your wallet...)

Avoid at all costs 1992-1993 model years, any model. Those are the real lemons!!!!

Although, as commented before, I have yet to see a W140 that hasn't require some type of A/C work, from an easy-fixed filter clogging to the infamous evaporator change ($$$$).

As for the W126 issue: the W126 and W116, design wise, are the nicest designs M.B. have yet perfomed on the S-class theme. The W140 is nice but not to die for, although, in terms of size and comfort features, it wins hands down (even over the W220). In terms of driving experience, the W140, the more your drive it the more it "shrinks" (it feels much smaller and agile than its size would let you beleive).

In terms of buying used: get a rencet '97-'99 model, with a FULL history, NO accident damage (even if it was repaired by an authorized dealer) and definitely low mileage -certified- (less than 40k).

A. Rosich
S320, 1998
E320T, 1995