Hiya gents,
I have a 2012 Mustang with the 3.7L that is specced for using 5w20 with Ford WSS-M2C945-A.
I live in Canada and its getting quite cold here. I know that the 5w20 is certified for down to -30C/-22F, but already at -20C/-4F I am seeing much more laboured cranking and even brief oil...