Originally Posted By: HangFire
Agree, anything that starts with 0w-.
There was a discussion about that claim a couple of years ago using Mobil 1's numbers. And according to those that know on here until you get to extremes like -20F and 30F, Mobil 1 5w30 was actually thinner than Mobil 1 0w30. Definitely thinner than 0w40.