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I'm almost certain this is an aftermarket transmission filter issue. I had the slipping issue in the cold morning after a transmission filter/fluid change. Swapped out the aftermarket filter with an OE filter and problem solved. 60K miles later after the OE filter swap (140K miles on the clock currently) and still no slipping.
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2004 X5 3.0i
Born 02/04
Delivered 03/04
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