Well in that case the best W126's to buy are the updated 1989-91 versions. Better sound system, interior, some had traction control ect.

They had a lot better sound systems, you can upgrade the speakers with some good ones, throw in a couple real high end amps and have a system as good as any in a modern car.

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