Yup, that's probably it. So denial isn't just a river? It drove fine for 110,000 miles, then failed 50 miles after getting a fluid change. And that's never happened before.

It would be funnier, though, if the other poster didn't have to pay for a new transmission now.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue