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Your 330xi uses Dexron III in the transfer case. Redline D4 isn't certified as a Dexron fluid, but it is a generic fluid that Redline recommend for Dexron applications, and it is wet. That transfer case is a low stress application, with no clutch plates, so I think it would be fine.
Why not do the X3 first, and see how much fluid you have left? The transfer case holds very little.
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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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