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Audi A8 Transmission and Final Drives Fluid Level Checking and Filling Fluids in Transmission and Final Drives overview There are multiple fluid cavities in the transmission. This includes automatic transmission fluid ATF , and gear lube. The ATF is used for the torque converter, the part that couples the engine output to the transmission input. The output of this device is the input to the distributor gear. The distributor gear is aft of the torque converter. The distributor gear has its own cavity. The distributor gear drives Output pinion to the final drive front The driveshaft through its output drive flange The final drive front drives the two front axles. The final drive rear rear differential drives the two rear wheel shafts. The 4.2Q has three differentials or sets of gears 1. Final drive front 1.4 Qt 2. Distributor gear 0.9 Qt 3. Final drive rear 1.6Qt All specify SAE 75 90 synthetic gear oil; Audi P/N G 052 145 S2 The Audi Distributor Gear is akin to a 4WD transfer case; the transmission drives front and rear axles through this center differential The A8 4.2Q Distributor Gear Seal Replacement Procedure posted was aimed at the center differential driveshaft seal located at the very rear of the A8Q transaxle assembly. It is apparently prone to dribble gear oil on the LH cat converter. Just FYI, 75 90 gear oil is used in extreme pressure applications such as differentials. It is very slick and viscous, and generally has a strong smell. Auto trans fluid is about 20 wt; like motor oil, and is good for hydraulic fluid duty and low shear gear trains. The most common these days is Dexron, which is always distinctly red in color. The A8 calls for VW ATF ; 10.4 qts new, and 4.2 qts when changed. The rest 6.2 Qts stays in your torque converter, etc. FAQ’s http //groups.yahoo.com/group/AudiA8repair/ Revision 1, 3/29/02 Audi A8 Transmis