EP 80W-90 Gear Oil is a mineral oil based lubricant formulated for use in a wide range of automotive, plant, agricultural and industrial transmission systems. This grade has a high level of extreme pressure (EP) additive that provides effective gear protection over a range of temperatures and shock load conditions. EP 80W-90 Gear oil will also protect components from rust and corrosion.
 
This should provide enough gear oil for up to 5 gear oil changes.