Can I use this to grease truck?

Man people will say anything just to hear themselves talk, not you the guy that said don't mix grease.
There's really only one kind of bad grease, one that will destroy things in no time. Any guesses? It NO GREASE. Any grease always beats no grease

 

I believe that's a calcium sulfonate complex thickened product as most of Amsoil's greases are and those are fine to mix with Lithium complex greases which are the most common. That's also a 5% moly grease for Caterpillar heavy equipment. That would not be the best one for wheel bearings, universal joints or other high speed bearings but very good for low speed/high load grease points.