I used VOA results for G-oil from here: http://www.pqiamerica.com/January2012A/January2012R2/goil.htm and plugged in the viscosity calculator here: http://www.bobistheoilguy.com/viscosity-calculator/ The result is 4.37 cSt at 150C Very impressive. Explains higher oil pressure that some reported, lack of API starburst (no fuel conserving), and good wear numbers on UOA. However, increased fuel consumption could negate savings even when one gets the oil free after rebates. Edit: never mind. I plugged in the other oils and got similar results: http://www.pqiamerica.com/Janaury%202012%20test%20results/Jan2012b1.html I guess the calculator doesn't approximate HTHS numbers.