Hi Frank
Long time no chat nice the see you are still at the wheel
I'm inclined to steer you towards the Calcium Sulfonates as they were designed for steel mill type applications,
Polyureas will perform OK in these applications but I think the calcium sulfonate will be the superior product.
Polyureas are excellent grease for hot no regreasing application as the thickener will not solidify significantly in over temp situations.
The calcium Sulfonate can "lock up" if not relubricated in hot applications but most of your applications are lubricated via auto lubricator so would work OK,
The main advantage of the calcium Sulfonate is the thickener is over based providing very good corrosion control in addition to the ability to lubricate well when mixed with water.
I think the importers all utilise the Mobil Exxon calcium Sulfonate (Was Witco), the 400 cSt base oil version would suit,
The opaque light Brown Grease Uses CaCO3 as the boundary additive so no chemical EP and no reactivity from water being mixed.
Hope this assists.
Best regards
Rob S
rttech.com.au