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I have 325,800 miles on the original fluid with no shifting problems. I average 4000 miles per year of towing a 1300 pound PWC trailer with a Thule rooftop carrier.
The only thing I would consider doing is draining the fluid into a clean container, changing the filter, clean the pan, refilling with the old fluid after running it through a strainer, and topping off with the appropriate fluid.
Then, save up $3500 for a re-manufactured transmission.
2002 3.0 325,800 miles
2014 428i 29,000 miles
2004 325i sold at 123,600 miles
2001 325i sold at 66,000 miles
1970 Firebird - under restoration
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