Been thinking about replacing my W126 with something a little more modern, a S500 coupe maybe. There are 4 or five of them on the local CL with asking prices of just over 6 to almost 13 grand. I've been trying to do my homework on the 140. The cognoscenti are telling me the materials - leather, etc are better with the 95 and earlier cars, but the biodegradable wiring and other reliability refinements speak to the 96 or later models. I have a relative who used to own a 600 coupe, and listening to him lament a $7000 tranny replacement is not something I'd like to repeat. So, what mileage is too much? Obviously a one-owner fastidiously maintained all records car would be preferable, but other than that, are there any options one would NOT want for reliability reasons, or service histories I have to be certain was performed, lest I'm asking for trouble? I realize these cars are very sophisticated and a lot can go wrong (at least compared to my 560 SEC). Thanks in advance for your advise. Also, has anyone owned both a 126 and a 140 who can speak to the differences?