That was a good back and forth exchange. I have my own thinking on the matter, which happens to be the modern lubricants including partial and full synthetic oils, differential grease, bearing grease are improvements and perform at least as well as older products, sometime's significantly better. Overall, and I don't mean to be insulting to anyone, but a forum member who is a metallurgist and looks at bearings and races and seals and gears, etc. one should pay heed to until if and when the time come's he is proven wrong, which obviously take's ten's of thousand's of hours designing methodologies to test hypotheses and then to repeat and repeat the tests. But, both of you gentlemen raised a good discussion of the issue(s) involved. I think that is precisely what this forum, and this thread in particular, is for. Thanks. again.