Yup Big John. Mobil 1 0W-40 is my choice year round. We hit 90+ here in the summer. Why wouldn't I want the oil to flow as fast as possible on startup, year round? And, for those doubting the x-40 part, the inside of your engine once fully warmed up is the same, regardless of how boiling or freezing the weather outside is.
0W-40 all the way for MOST cars is my $0.03. (5w-40 formulations are good too.)
0W-40 all the way for MOST cars is my $0.03. (5w-40 formulations are good too.)