I'm going to give it a shot during my next service, because at $21 a gallon it's just cheaper...il save $10 because I have to buy two containers.
I have a lexus and I've run a few different things....Mobil 1 (seemed fine), Carquest synthetic (seemed fine) and now TGMO 0w20 (seems loud in the engine).
None of them have gotten me better fuel economy. None of them burned oil. None of them got dark too quickly. I have had virtually the same results from them all...lose a half quart at 5k miles and the oil stays clean until 4k miles...then I change it at 5.5k miles.
I imagine QS synthetic would be fine in my car - from everything I've read it's basically PP. An oil that is good, but maybe not made for extended oil changes. And I've none done an extended drain - although I'm going to give it a try with TGMO - if for nothing else, but to justify what I paid for it.