Originally Posted by rmfnla
No, but I am a licensed Mechanical Engineer (not practicing) who recognized BS when he sees it.
Grease not becoming effective? What a load of crap. The purpose of grease is to reduce friction... period. The specs and additives and all the other hooey is intended to help it continue to do so in extreme environments. Grease designed for automotive use is still considered "all-purpose; unless you are using something really purpose specific like Lubri-Plate it just doesn't matter.
And, temperature resistance is not always related to viscosity, but you keep listening to "the experts";their jobs depend upon it.
Here is a quote from this guy: Bo Jacobsson.
Professor of Machine Elements at the Lund Institute of Technology
1973–1987 – Professor at the University of Luleå 1987–1997
– Consulting engineer at SKF Engineering Research Center in Nieuwegein, the Netherlands, as well as associate professor at the Chalmers Institute of Technology and the University of Luleå.
"It is a well known fact that the oil can bleed out too fast at high temperatures. There is a trend for modern machines to be constructed so they can operate at higher temperatures than old machines, so the lubrication industry has developed lubricant greases that can be used at increasingly high temperatures. An important step in this development was the emergence of lithium soap.
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."
Apology accepted rmfnla.