Here is the first UOA from this component, the Rear Differential of my 2006 Toyota Tundra Limited Double-Cab 4WD. Note this is from a Limited-Slip differential, and 4 ounces of Amsoil Slip-Lock additive was added to this oil (4 ounces added to 4 quarts of Amsoil SVG 75W-90). Note the very high TAN - I was rather surprised. Note I am also posting other UOAs on the Front Differential and Transfer Case in this vehicle. This lube was in service for just over 10,000 miles. There was some light towing (2,500 pounds MAX on level terrain, vehicle rated for 6,600 pounds). Towing occured less than 10% of the time during this interval. Note this was the second fill of Gear lube on this vehicle, including the factory fill, which was changed at just over 5,000 miles. I am planning on opening a separate topic about the high TAN levels on this and 3 other UOAs on gear lube I have received recently. Meanwhile, here is the UOA on the Rear Diff: