Well mileage isn't everything age is worse. The problem with 100k miles W126's at this stage in the game is unless it was a weekend or toy car it was driven around town. That means the doors, trans, and suspension have a lot more wear then a highway driven car. Also the interior on a highway driven car is generaly in better condition because usually only 1-2 people are in it at a time. Mine for example was a commuter car so only the drivers seat has a lot of wear. The back seats look like new and the passengers is very nice.

Around town is also harder on the engine, engines like constant speeds it is good for the bearings. Highway driven engines are usually cleaner inside if they were taken care of because everything can burn off.

Now I know of a few "toy" W126's that look like they belong in a show room. They are one owner cars that don't know what rain and snow looks like. But a perfect example like that will run you at least into the mid teens if not closer to $20k. (an SEL not an SEC, SEC's have a higher value)

At this stage any W126 is going to need a lot of work their are probably very few well sorted examples out their. But condition must be judged on a car by car basis.

Is a 100k 300SDL better then a 200k SDL? On ebay the 100k mile one might sell for more but you might not be getting to much more.

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2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200