It is interesting that there is no requirement for oil or air filters, other than following the mfg requirement.
The warranty does not read like a marketing tactic, but at it's heart, it is exactly this. "Buy our brand of oil for the next 15+ years, follow the manufacturer's service intervals exactly, and we will warranty your engine if the failure is conclusively proven to be oil-related."
For all of us BITOGers who keep our vehicles long enough, the majority of our engines will go at least 300,000 miles never needing this warranty... many will go 500,000. All the while, many of us are going far beyond the manufacturer's recommended oil change intervals, without any trouble whatsoever.