I need to do some head loss calculations for pumping diesel fuel or No. 2 fuel oil from a storage tank to an emergency generator. I see in many places that diesel fuel is specified to have kinematic viscosities of 1.3 to 4.1 cSt at 40C. However, under worst case scenarios, this fuel is likely to be at or near freezing. I suspect the viscosity could increase one or more orders of magnitude at 0C. Does anyone have information on the variation of viscosity with temperature? Ideally, some sort of power law would be great. Alternatively, links to graphs will do.