Well I read all the way thru this post and I didn"t see where anyone stated that the S/W [as I understand it] is for Summer/Winter. If its icy you put in W so you don't spin the wheels when you take off. I belive it also uses a different gear in reverse so you don't spin the wheels.
On a different note "HUSK" what is a "Argos Bluetooth kit" that you have on car? Thanks in advance for a reply.

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1998 E300Turbodiesel
1980 300d

Ready- Ronnie