Lol, Thank God not me... I am like a good church boy, changing oil religiously using only approved oil and changing it every half of recommended OCI. Also using OEM oil during warranty in 90% of the timeSo what sort of warranty claim are you envisioning here where lubricant selection/performance is suspect but "why" isn't clearly enough defined by that choice that it requires a court battle?
It was hypothetically speaking due to some of the claims here and my doubts that a well maintained engine will be denied a warranty claim even with wrong viscosity and wrong approvals. But the assumption was, it was good oil like HPL