[mrtexas]

I scheduled production of lube oils at a large Gulf Coast refinery for a couple years as a Chemical Engineer.

Another bit of trivia. Viscosity is a measure of a liquid's resistance to flow. The unit of measure are cSt or SUS. For lube oils in the metric system, the temperature of measurement is 40C(104F) and 100C(212F).

The primary measurement of lube oil quality, viscosity index, has to do with how the viscosity changes between 40C and 100C. The best lubricants change the least in viscosity with temperature. You don't want your lube oil to thin too much at high temperatures or stiffen up too much at low temperatures.

cSt stands for centi-Stokes and is a metric system unit

SUS stands for Saybolt Universal Seconds Viscosity can be measured by filling up a standard sized tube with a measured hole in the bottom of it at a specific temperature. SUS is the number of seconds it takes to empty the tube.