I changed my oil yesterday and I couldn't get the crushable washer off. It really had a deep impression of the drain hole. I got it off using channel locks and a wrench, had to thread it off. I never had to do that before. The previous oil change was done by the dealer when they did my timing belt. Found out today that our 06 Mazda 3 also has a crush washer, and the dealer charges $.90 each!