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The transfer case isn't lifetime fluid. When it has degraded to a certain point, a warning comes up advising to change it (fluid out of spec). If you change it ahead of that, fine, but the computer is measuring the fluid and seeing that it is still fine (based on the fluid properties, not the colour). It is condition based servicing, not preset change intervals.
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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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