Not condescending, just think about what you're saying. The 2 "recommendations" you quoted above this, 1 I replied to above. The other was a response to your old unknown u joints, not new ones. Pumping grease in them frequently is also a cheap/easy way to blow the seals out for good. Actually you don't even want to see grease come out and once you do, stop. Old u joints, the grease passages can get plugged where not all the cups are getting grease when you add it. Sure if you're in that situation, try to ram some grease through them and hope it gets to all 4 cups. Otherwise, give it a pump or 2 every 10k miles, maybe, if you're actually putting on some real driving? And 2wd miles don't count with your lockouts. "Greasable options typically have recommended grease intervals for on-highway applications of 40,000-50,000 miles or corresponding to normal maintenance schedules." - From a machinery publication... So my friendly answer is I use either A. Whatever is in the grease gun. Or B. my preference is Lucas Red n tacky. Idk why. Maybe because it works. Probably like most grease.