5VZ-FE engine
Mobil1 10W-30 for the last 20K miles (I'm at 194K and the Mobil 1 didn't make the valve covers leak any worse)

Automatic Transmission
Whatever it came with when I purchased the truck with 121K. Looking to replace this with a synthetic; probably Mobil 1 or Redline.

Transfer
Generic non-synthetic 75W-90

Rear Differential
Mobil1 75w90

Front Differential
Generic non-synthetic 75W-90

Chassis and Hubs
Mobil1 synthetic (aggravates the snot out of me how the stuff seperates and oozes out of my grease gun)

Brakes
Toyota OEM DOT4

Steering
Dextron type ATF (never changed it)