Did you go with Amsoil?
I should've posted sooner, but yeah, it's the real deal. The company I manage uses it exclusively in our fleet of vehicles; never an oil related failure in the 18 years I've been here and we've pushed a few of our trucks over 300,000, but you have to give credit to engine design and a routine maintenance schedule, BUT these trucks do not see an easy life.
I use Amsoil personally as well; no issues. My last Suburban was sold with 245,000 on the clock and still ran like new, but those 5.7L engines are great. I currently have a Silverado with 80,000 on the odometer and a Ram 2500 with 118,000 Amsoil in both since they were new. No issues.
IMO, they make some of the best gear oil on the market.
