Considering the fact that the Motorcraft oil one would find on Walmart shelves is a semi-syn (blend), and that the QS was unspecified, I don't quite understand the original post. Is this against QSGB, or?
I have used both MC blend and QSGB but since one is a blend and one is a conventional... what is the meaning of the question?
It's apples and oranges.
~ Triton