^ It isn't that Supertech is bad. It is that vehicle warranties call for usage of oils that meet the manufacturer specifications.
Straight from the owner's manual for my 2007 Ford Focus: "To protect your engine’s warranty use Motorcraft SAE 5W-20 or an equivalent SAE 5W-20 oil meeting Ford specification WSS-M2C930-A."
Supertech Full Synthetic 5w20 does not meet Ford WSS30 (or the updated Ford WSS45), and would not be deemed appropriate protection by Ford.
I'm also intrigued what brings about this questioning. You have been member on these forums for 7 years with 7000+ posts.
Notice the underlined portion of my original post FutureDoc. I am fully aware that Ford WSS30 is an outdated specification, which is why I mentioned the up-to-date Ford WSS45.
Getting back to my original point, SuperTech does not officially meet any manufacturer specifications.
I am no Ford guy, but WSS 445 is non-existent in my quick google-search. I am assuming you are missing a "9" in the typing.
ST meets m2c946 which is the main concern for 5w30. I expect it is m2c945 for 5w20. (Would be odd for one but not the other). Basically Ford uses ISLAC GL-5 so if it meets that, you are good (few exceptions exist... not as up-to-date with the Eco-boost demands either).