In looking closely at the specs for 0w40 Mobil 1 in comparison to their 5w30, I wonder how it's even possible for them to create this oil. Their 0w40 is considerably thicker at 40c, it's 80.3cst vs 53.7 for the 5w30. So if it's that much thicker at 40c, how can it flow so much better at cold temps to be a 0w oil? Is the base oil that radically different, and if so, how? Or is it all done with pour point depressants?