The old report on PQIA shows a meh noack. The comparison of the two reports on 5w20s shows a clear improvement, and I imagine the same happened with the rest of their lineup. With Chevron's kicking add packs, I'd not sweat the noack as much. If noack is a concern for your specific engine, I'd be looking at synthetics instead. Why are you sweating it anyway?
I like Chevron Supreme ... Our 2014 2.4L DI says use QS but I used to feed it CS for many years. I have now upgraded to synthetic and switch between PP and M1 EP. Another old car gets cs 10Wx30. Another old car gets cs 5Wx30.
recently I've been reading a lot of good posts about QS and ST ...i think QS maybe more of a syn-blend than CS meaning more % of syn in the mix than CS but that's purely speculation on my part. My 5Wx30 CS doesn't even say syn-blend on the jug but it says so on their website!I
Maybe you need to have certain % to advertise on the jug! idk