Silicone differential oil or grease?

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Im.blown away by the amount everyone strips there diffs etc. I drive mine very harď through mud and dirty silty water whenever I can and the most maintenance it gets is a hose pipe and wd40, YES WD40. I don't strip unless it's broke or making the worst noise ever. I'm sure my trucks see a lot more trail times than most people wrenching presuming something is gonna break.

Just something that I do on every new RTR... as they say RTR = Ready To Rebuild!

You never know if the people who built the thing actually greased things or just waved the grease pot over the gears and whispered a prayer of long life.. So I pull the drivetrain apart after a bit of an innitial test to make sure everything is good and slick.