http://www.epa.gov/smartway/documents/lowviscositylubes.pdf
Not having hands-on or technical experience (as of yet in my coursework), it would seem that low-viscosity fluids wouldn't be able to absorb heat as well... is this true in experience?
The difference in handling heat has more to do with the quality of oil and the base stocks being used.
Gotcha. I guess I'll have to get rid of that misconception as well. So many, I have...