Just so I'm not double-posting, here is a link to a post from another thread:
This is the newest iteration that is marked Dexos1 Gen3. According to their PDS: https://msdspds.castrol.com/bpglis/FusionPDS.nsf/Files/BD0AFD9B1949F369802588F4004DD711/$File/bpxe-a4x82v.pdf the viscosity should be 11.3. This sample weighed in at 10.5. Overall a pretty decent looking additive...
bobistheoilguy.com
The videos I linked to are queued to play from the relevant part, so you only have to watch a couple of minutes rather than the entire videos. He certainly makes it appear that High Mileage oil is definitely NOT snake oil.
After watching his videos and looking at these VOAs, it appears that focusing on the Oxidation values will tell us which oil has the most seal conditioning esters. From that standpoint, the Mobil 1 EP wins, followed closely by Valvoline EP.