You keep asserting that a lack of ZDDP is the problem and linking these stories. I keep pointing out that the problem isn't a lack of ZDDP, but a lack of anti-wear protection in oils not formulated for the application. I don't see how this can be seen as anything but factual. ZDDP is not the only solution to excessive wear. It may be a good solution, but it comes with its own drawbacks and is therefore being replaced by alternative technologies. If you can come up with a source that shows the tribofilm provided by ZDDP is the only thing capable of preventing wear on these cams, then your assertions will have something to back them up. Until that time though, I am going to go with my own personal experience of experimenting with dozens of alternative anti-wear and extreme pressure additives to replace ZDDP. ZDDP can be replaced. It isn't always cheap to do so in some applications, but it can be done and is done by formulators. And not only can it be done, but it can be done with added benefits and higher performance than the original ZDDP based system.