When I last looked (admittedly a while back) I was comparing Pennzoil SRT 0w40 to M1 0w40 and looking at the traditional additive numbers I thought M1 had an edge- though a 30 buck oil analysis doesn't really give you a big picture. Looks like they now have a "Euro" 0w40, which would probably have to be a little stouter and presumably more like their previous Euro 5w40 (the SRT engines, save possibly the Hellcat, are like the GM LSx in that they are extremely gentle on oil for the amount of power they put down). I don't really know much about "Platinum Euro 0w40." , I'm just seeing it in small quantities- not enough on the shelf for an OC!- in my local stores.
Pennzoil has gone and confused everyone again, now putting Platinum in a yellow bottle. Seriously... they've shot themselves in the foot over brand continuity with all the re-packaging and re-branding they've done with Platinum, then Ultra, then Ultra Platinum, silver bottles, dark silver bottles, black bottles, and now yellow for the synthetics. The products are great, but whoever keeps diddling with the brand identity should get a smack on the noggin.