I have worked at several new car dealers and have seen every OE used brand seize installed in the factory (assumedly to factory recommendations) in the threads if left in too long, Champion, Bosche, NGK, Denso... The anti seize not only provides lube when its time to remove it it also fills the voids to keep those combustion byproducts out, I have never pulled a spark plug with anti seize on it that was seized in the hole.