lots of places have that machine. i wouldnt trust firestone to change my tires, let alone do a coolant flush...i had so many bad experiences with them, I have no clue why I kept going back. oh wait, now that I remember, I had a friend that worked at the one I used to go to. He and his boss later got fired. I guess they were too nice to their customers. after going back, the service writers and techs always pissed me off somehow, either they were just rude, or didnt do something right on my car.

however, thats irrelevant to the issue here.

using those machines correctly is a nice method, but not necessary.