OVERKILL
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I don't think that's accurate, based on what I've read about AN's. POE has a heavy impact on seal swell. AN's are far closer to neutral on seals (while still having some seal swell tendencies).The video says AN has comparable POE affect with seal swell. I kinda wonder why they have all three base oils in a few Mobil 1 oils?
I'd highly recommend reading this paper from the STLE, which I shared in my thread on Dr. Rudnick:
There's also this presentation from Chevron:
Which features the following table:
Which notes that esters cause seal swell, while AN's have less impact on seals than esters.
Esters do have some advantages, and Mobil's POE esters have much higher VI's than their AN's, so the combination of the three bases (originally called "tri-syn") was designed to capitalize on the strengths of all three bases, while neutralizing their weaknesses.