Can we use cooling system seal tabs in all anti freeze types i was listening to a service manager while picking up parts at Hyundai that said to a customer that adding seal tabs will void their 10 year 100,000 mile warranty and destroy the cooling system. Im pretty sure that Hyundai has pretty much one anti freeze unlike say Mazda that has a few of them and seal tabs won't hurt a thing. we use the seal tabs in some engines we rebuild just to be on the safe side. And there are many engines that come from the factory that way. I think some of these guys talk just to hear themselves..