I was advised to hide the math page. The basis of the viscosity vs temp equation is based on the ASTM standard Walther equation which is from ASTM D341. The numbers line up very well with rohmax http://www.rohmax.com/product/rohmax/en/about/calculation-tools/viscosity-index/Pages/default.aspx
viscosity calculator and the widman viscosity chart http://www.widman.biz/English/Calculators/Graph.html.
Please PM me if you would like something more detailed or i didnt answer your question. I have not been on Bob as much as i used to be and sometimes my old posts get overlooked. I would appreciate your feedback as well as i am open to improving the .xls. Im not a professional blender or anything, Im just an engineer that does this stuff for fun because i find it challenging and interesting. I do believe these equations are generic and will not predict very low temps correctly. quality of base stocks and VII's that are used in each particular oil is generally proprietary and probably makes it impossible to graph each oil exactly correct. This is nothing more than an excel version of the widman calculator.
viscosity calculator and the widman viscosity chart http://www.widman.biz/English/Calculators/Graph.html.
Please PM me if you would like something more detailed or i didnt answer your question. I have not been on Bob as much as i used to be and sometimes my old posts get overlooked. I would appreciate your feedback as well as i am open to improving the .xls. Im not a professional blender or anything, Im just an engineer that does this stuff for fun because i find it challenging and interesting. I do believe these equations are generic and will not predict very low temps correctly. quality of base stocks and VII's that are used in each particular oil is generally proprietary and probably makes it impossible to graph each oil exactly correct. This is nothing more than an excel version of the widman calculator.