quote:Originally posted by Miguel Azevedo:
Stay with your rationale as exposed along your first 2 paragraphs. Paradoxically, the purported advantage of multigrades easing cold starts is even more real at the higher than 100C temperature range! You can easilly see this in a log-log chart of viscosity and temperature, as you extrapolate the straight line trend further into the high temperatures.
PS: the text above needs correction. What I wanted to say was "associated to ease of cold starting, multigrades surpass monogrades in viscosity above 100C" . And viscosity -all things equal - is what separates metal from metal.