quote: Originally posted by Chris A: The "0W" simply means that the oil had less than the required viscosity at -40*C to be labeled as a "0W". It infers nothing about the 0*C viscosity.
You're saying a 0W is thinner at -40C than others in order to be labeled a 0W. Well if the 0W oil is thicker than a 5W at 0C, it isn't going to be much thinner at -40*. M1 0W-40 is a thin 10W-40.
"Well if the 0W oil is thicker than a 5W at 0C, it isn't going to be much thinner at -40*."
Being a non-newtonian fluid, no assumptions can be made about the linearity of the viscosity of these oils. At any rate it would be the 5W that would be much different at -40 than 0.