Every vehicle I have owned gives a recommendation on oil ie..0w20 every 10k miles, however, if you continue reading it will say that if you tow, drive in dusty conditions, or in a lot of stop and go short trip that you need to change it every 5k miles and higher viscosity my be more suited.
Im confused about the warranty being denied, when the owner manual say this, the problem is the idiots at the dealership who say ever 10k is all you need and it must be 0w20 haven’t read a owner manual either.