some years back I saw or read something about dot 5 swelling seals/rubber stuff. i'd been using dot 5 on one of my cars for several years and thought i'd better check this out. it was complete bunk. no damage and everything was as good as the day it was installed. I don't understand the anti dot 5 thing. I probably have close to 25yrs on the brake system with dot 5 and the car has never stopped better.