Oil Pressure Issue?

So does that mean everything with the "W" in the middle of two oil grades is winter blend? Because that's on store shelves year round.

I gotta throw in on this. I was taught that the first # is what it flows like on start up, and the second # is the protection you have after it`s warmed up. phillups 66 used to make a 20w40, I ran it in my 68 form-383-form S fastback when it was new. really liked that oil! don`t know when they dropped it.