Their is a guy over at MBworld or Benzworld that knows a lot about lowering these cars. He knows his stuff a simple search of their W126 forums should turn him up.

He seems to think it is a bad idea for a daily driver. Suspension parts wear much faster so you will need to replace everything when you lower it. Also depending on how low you go the inside's of the tires will be eaten. So you will eat tires.

H&R makes probably the best lowering kit for these cars.

However after doing a bit of research I decided not to lower my car.

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