At last someone with some evidence based advice on engine oils
although it doesn't seem to have been approved by any car makers to meet their specs.......
Not comparable in the slightest in my opinion, but i am always skeptical. Aside from the fact that its a thicker grade (which is more suited in my opinion when you consider the oil temperatures these cars see even in standard trim). Driving style, service intervals, state of tune, etc etc. will all play a part, too many variables.
I've no doubt it's better than a 5w30, but doubful how much improvement there would be over Quantum 5W40, which i've seen recommended for these engines by a very good and well respected engine builder. I stand by what i said, i would rather change the oil twice as often as these engines foul their oil pretty quickly.