Liking this vid. Interesting all the facts and testing he shows. 3 thumbs up (if I had an extra thumb...).
It shows the pistons from some Annual Protection testing, which the XOM website purposely hid before! They do look kinda black. I suppose they're wasn't any stuck rings all the way to 120,000 miles for the Lexus, Chevy, and Ford DI-turbo engines though.