I need help with gear oil..

[Matt]

I have read over and over and over that I should be putting a gallon of gear lube in my engine at every oil change and I cannot bring myself to do it, I think because I don't know what exact kind to use.

http://www.canadiantire.ca/en/pdp/motoma...p.html#srp

What about this stuff, would it serve the purpose? What brands do you guys use?