not trying to call you a liar or anything, but are you sure it calls for 20?(can you double check the manual?) I was under the impression that all the boosted engines were spec'd at 5w30...
I know dad's '15 escape with the 2.0EB is....
...huh... that's bizarre, the Amsoil site confirms 5w20 on the 1.5 EB...weird...
anyway, unless someone has a pressing reason, like a tsb or something to explain why it's spec's for a 20 over a 30, I'd run a minimum of an Xw30 in any Turbo engine..