It also says "to only use" and the guy's lawyer can twist that to mean "only" those listed (above).they do use the wording "recommended" but also do not recommend any alternative.
I doubt any lab can, with 100% confidence (this would be needed for court, I think), distinguish between a 0W and 5W winter-grade classification.Did the plaintiff do a VOA to see if it is just a documentation error or really a class action issue like they have internal memo telling people to use 5w30 instead of 0w30?