I would like to ask as a student who want to learn chemistry.
Since I started, I've been thinking that most of high temperature and friction grease can be applicable to motor lubrication. Some guy spoke that I should use a grease specialized motor lubrication such as Polyrex EM of ESSO.
I wonder what is difference practically in performance.
I have 12 years old building and took over the maintenance contract recently. When I was doing inspection, I opened inline filter housing of closed heating loop water and found that it was almost black in color; filter was replaced only two days ago. So, I looked drain water. It contains black particles which looks like black coffee. I looked the chemical company service mothly report; sulfide supplied to the system on monthly basis. On the other, site handyman who have been working for 10 years insists that it should be no problem and no matter when he looked the filter, its color was same.
It does not look good to me.