Synthetic 5w50 Schaefer oil

They said I can send in several samples for free since I just switched all our loaders and equipment over to Schaefer. I doubt I'd ever see 5000 miles on it anyway. I'm one of those guys usually changing it every 2000 or so, just because I like to beat the snot out of it on a regular basis. All my hunting and fishing spots are pretty hard to get to, and there's always someone around that needs their Z71 or Super Duty pulled out of somewhere by my rusty old dodge