Every fleet owner should know the basics about the viscosity of the lubricants they are using and why the viscosity matters. Fleets—especially mixed ones—require a variety of lubricants. This ranges ...

Different manufacturers have replicated the Zahn cup, leading to significant variations in efflux time between cups of the same make, production runs, and even within the same lot. Variations ...

The earliest attempt in the industry to link different viscosity cups' outcomes and associate each with mathematical formulas based on core measurements was made by a sub-committee within ASTM ...