Funny, I got recommended that same video and watched it. He didn't say anything about the health of the engine or why it was being torn apart, just that it was sludged up and the pistons covered in carbon buildup. He did say that he had "shown us" the pistons though, so I went back through his videos and found the video in question where he had the thing torn down. There wasn't any evidence of the OCI, you just have to take his word for it. What he didn't mention in that first video, but did mention in this one, was that it was being torn down due to coolant intrusion (engine in question is the 1.5 ecoboost - known for coolant leaks due to bad design). I don't think you can draw any serious conclusions about suitable OCIs from an engine that is leaking coolant into the cylinders and into the oil.
He also calls out people for arguing with him, saying that they are just random internet strangers while he is a master technician for Ford and he sees these problems all the time. That you can't trust Blackstone Labs telling you that 7,500 mile OCIs are fine because he sees engines with OCIs less than that which are all sludged up. Well, that's a bit of a flawed argument. If that's all the criteria needed to assume that he must be right that all of these engines have problems and all OCIs exceeding 3k miles are bad, then the same must apply elsewhere. If a veterinarian says most animals are sick, then most animals must be sick (guess I should tell my two dogs to stop acting like everything's normal). Most toilets must be broken because plumbers see broken toilets all day every day. My elementary school principle probably thinks all kids are bad since I was sent to his office on what seemed to be a daily basis. It just doesn't work that way. Frankly, unless you have a Ford and have to watch/subscribe to all Ford technicians on YouTube, then his channel really isn't worth much of a watch, in my opinion. It looks like most of his videos were done on some other form of media, like Snapchat or TikTok, as they are around a minute in length. Not my cup of tea. Not only that, but there are plenty of really good and informative channels out there, like South Main Auto, that are worth watching/subscribing to.
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