To answer your question, I have been on this board since it started, and I don't recall much discussion about additional external transmission coolers being installed. I think it may be a solution in search of a problem. I just don't think that transmission failures are commonly caused by excessive heat on the X5. I do agree that excessive heat is a common reason for transmission failures, just not on the X5.
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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
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