Can I use this oil in the differential? (Pic inside)

I found a couple of bottles of this laying around and I was wondering if I could use them in my differential (with friction modifier).

It is Motomaster Extreme Pressure Gear Oil SAE 80W-90 for Automotive, Farm and Construction vehicles

It says it is suitable for limited slip diffs, and meets API GL-4 and GL-5 and PH-2 specifications.

If I shouldn't use this...then what should I use?

Thanks

redline is good stuff http://www.redlineoil.com/products_gearlubricants.asp?subcatID=20

I am trying not to spend anymore money then nessessary...thats why I want to know if I can use this stuff.

Thanks