It depends on how nice it is, if all the aluminum trim is dull the rest of it can't be super mint. The sun kills the aluminum trim and everything else as well.

Is the mileage original? Any service records to back it up? I never beleive the mileage on one of these cars, the odo's break all the time.

If its really mint it might fetch $10k or so, the early W126's don't seem to comand the nose bleed prices of the later ones.

If its tired or average $3k-$5k.

Take a lot of good pictures, then throw it on ebay and see what it goes for.

Unless you want to keep it.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200