2005 Chevrolet Express - 4.8 liter V8, 4 speed auto, rear wheel drive, 3/4 ton (2500). Ran Amsoil 0w30 for 12,125 miles (19,399 km's - I'm Canadian, eh - from about 85,000 km's to almost 105,000 kms). Van has Amsoil ATF in the transmission and Amsoil 75w90 Long Life Gear lube in the Rear...