OF course if you use an oil that damages the engine, not covered. Period.I was reading it and no where does it say Hey you consumer you can use the incorrect oil that your engine was not designed for.
But if you use a non-specified oil and your seat heater burns your warrantied car to cinders , the manufacturer cannot deny warranty
AND
If you use an oil, say that is not API listed, and some engine parts fails, unrelated to lubrication, the manufacturer cannot deny warranty
Unknown why so many here struggle with this simple concept.