I have given up, I have almost run out of stuff to change. Its not the wheels or tires, I have four sets between my two W126's and swapping doesn't make a difference.

The only thing I have noticed is the SDL does it a bit less, but has a lot less wear in the steering box to. I suspect that contributes to it a bit.

The SDL will track like its on rails to about 120mph, the suspension is fine. I say its just a W126 thing, they probably did it when they were new.

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