Oil with ZDDP ?

I also thought the video was good, factual verifiable info,, with the exception of the lawn mower test,, not sure what he was trying to prove but a 50 50 mix of new and old STP would be so thick that it would not provide any kind of ring seal. I don't recall STP ever recommended a 100% STP Treatment fill. That scene was a little out of step with the rest of the video.