Recently searched on WWW for the different grease products that are on the market with the different thickeners and numerous oil viscosity packages. (I had learned of the grease differences years ago but with locations like this message board it sure helps to bounce thoughts off others with such a vast background!)
Found charts explaining what is compatible with each thickener. Found recommendations for oil viscosity by temperature, speed and application.
As all have mentioned, I'm sure lube mixing as well as using grease with the wrong oil for wrong temperature, speed and application is happening. I will be meeting with those that can help correct this problem soon.
It is my belief that there are many maintenance people not aware that the various thickeners and oil in greases can be so different. I'm sure most would not put an oil with VG 150 in a combustion engine that uses 5W30 but they will put a grease with VG 460 oil into a ball bearing that will not see 120F and should use a VG oil of 115. It is just a matter of awareness.
I appreciate all the information and will enjoy sharing with the others.