Originally Posted by lawkd

That is a great article! And it underlines your point very clearly as to why there are some greases that do *not* function well *except* at high temps, therefore (just as Barnett said) they would not be good for bicycle use:

"It is, of course, a good thing that there are greases that function at high temperatures. But it would be wrong to believe that these greases will also function well at low temperatures. On the contrary, they often function very badly. The high temperature greases do not generally release a single drop of oil at low temperatures. In fact the opposite happens, and they absorb the grease that has already been released. This results in the object that is to be lubricated – for example a ball-bearing – drying out. With the increased friction, the temperature rises, oil is released and the bearing is lubricated again: then it cools down and dries out again, resulting in an increased pace of wear and tear on the bearing."

Now, how do we get grease manufacturers to let us know which greases have paraffinic as well as naphthenic oils? Some of them won't even reveal what thickener they use.