I recommend the Bridgestone Blizzacks. I have run them on my 83 240D for 2 winters, and this year put them on my 83 300SD. They make a huge difference, and I cannot image trying to get through winter without them.

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1983 300SD -- 220k
1983 240D euro -- 225k - sold
2002 VW Passat W8 - Fast
1985 BMW 528e -- 356k - sold
1996 BMW 328Ic - crumpled into bits