I have owned my 83 300TD wagon since new and have driven it most every winter in Minnesota. I have never added any extra weight as the car is very well balanced. I do have an extra set of wheels with Hakkapalita snow tires which make all the difference in the world. At times when I have been stuck in marginal slippery conditions with the summer tires on I have had traction problems. I swear by the snow tires...particularly this brand!

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83 300TD wagon
87 300TD wagon
89 BMW 325IX