A new filter & some good synthetic fluid (Redline or Amsoil) will do you a world of good. My friend had similar problems with a 6-series BMW in the cold winters of Michigan, he changed the filter & used synthetic fluids and got second gear back by the end of the block.

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Thanks,
Dave

1998 BMW 540i Sport
1995 E320
1992 400E
1989 BMW M3
1979 Triumph TR7 (1st car)
1986 BMW 735i (Sold)
1980 BMW 320i (Sold)