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Great! Sounds like you have a great source of SYN Gear Oil, or a poor source of the Dino stuff! The Synthetic may give you more piece of mind , and a bit less "warn up time" , if heavily loading in sub-zero weather.

My 2 cents- The viscosity of the synthetic oil would be A OK, as stated above. YOUR Business, buy why?? The axles, especially should be severely underloaded, relative to capacity and lubrication, for the mass majority of civilian users. If you must overload- you may be better served by 90w-140...