I currently own a '93 300D2.5 with 210,000km. I am looking for informations on a W126 300SD ('81 to '85) or a W126 300SDL ('86 to '87), maybe as a second car.

My question is about the 300SD: What major improvements were done through the years on this car between '81 and '85? Is '85 the best buy?

Thanks,

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