Kirk the only fact I see in what you posted was the author claimed that extended drains were the cause of problems, at least in the article.
Yes 4 K oci are old school, but in certain applications they are recommended, and needed, look at some of the Subie's out there and their suggested oci.
Synthetic oils have benefits no argument there, but even Amsoil, an oil darling is rethinking some of their intervals because people are having problems. [AMSOIL GUYS PLEASE READ IN CERTAIN APPLICATIONS]. So once again extended drains are not one size fits all, are not for everyone, should be backed up with oil testing, and not done blindly. Why is that so hard to understand? A very smart man told me run your oil your normal, OCI, get a UOA with TBN, stretch it based on that. There's data if that's what you want, and will eliminate guessing, and blind faith.
The article you posted proves that. Oil chemistry is evolving, but a sane maint' program is why people can log 500,000 or more miles.
Neglect is what keeps products like MMO, Kreen and others selling. The money is big in fixing neglected cars.
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