My "positive" Slick 50 experience: Years ago, probably 30 or more, I broke the spur gear driven shaft in the right final drive of my John Deere tractor while plowing deep heavy snow. That shaft snapped like a stick pretzle and the larger inner bearing was rough. Dealer got the shaft to me PDQ, but bearing was on back order. I assembled the tractor and contnued working as that gearing was growlling at me all the while. I added the bottle of Slick 50 (pint or half pint, I do not recall) and the bearing began quieting down and by the time the bearing arrived it was quiet. The hytran oil was Quatrol, the OE fluid. That "new" bearing is still in my parts collection wrapped in oil paper. It would always growl again soon after fluid changes and I added Slick 50 to again stop the growl; until I began using the more recent formlae of JD Hy-Guard. With the Hy-Guard there is no bearing noise. 1982 tractor, runs like new. Desperate measures for desperate times.
prs