15W-50 instead of 10W-40?

[ragtoplvr]

requesting an oil sample, and having a UV additive added at the factory are still quite a ways off from a "viscosity checker" (if such a thing even exists at the repair shop level of operation).
i'm still awaiting some kind of factual confirmation before i take that original "viscosity checker- believe it" statement off of the BS pile.

I would assume in the case in question, the factory had a oil test including viscosity correctly performed. Had something been amiss, they would have denied warranty. I doubt if a simple viscosity check would hold up in court. In the case I know of, about 2 days later they approved warranty work.