BMW 3 series, E90 / E91 / E92 (USA)

Additional Notes

• Across all listed xDrive and xi variants of the BMW 3 Series E90/E91/E92, the transfer case fluid capacity is 0.52 liter, recorded as an initial fill figure.
• An initial fill value represents the factory-measured quantity of fluid sealed into the unit at the time of manufacture or assembly, rather than the amount used during a routine service top-up or a full drain-and-refill overhaul procedure.
• The 0.52 liter figure is notably small, which is consistent with the compact, single-speed transfer cases typically found in longitudinally mounted all-wheel-drive systems used in rear-biased passenger cars.
• All six configurations carry a normal use condition designation, meaning the listed capacity applies to standard operating environments rather than severe-duty cycles such as frequent towing, off-road use, or extreme temperature exposure.
• The 325xi spans 2004-2006, the 330xi spans 2005-2006, and both share the same 0.52 liter initial fill as the later 328xi and 335-series variants, indicating no capacity change occurred across the transition between those earlier and later model year groups.
• The 328xi and 328xi SULEV are listed as separate configurations covering 2006-2012, yet both carry an identical 0.52 liter initial fill, showing that the Super Ultra Low Emission Vehicle designation did not alter the transfer case fluid specification.
• The 335xi uses the N54 engine and covers 2007-2010, while the 335i xDrive uses the N55 engine and covers 2010-2013. Despite the engine change between generations, the transfer case fluid capacity remains 0.52 liter for both.