question out there I just tried to flush my radiator it had dex cool and i switched it over to regular anti-freexe coolant/and used the prestone flush treatment. I did a regular flush on my mazda (reg antifreexe/coolant) and the prestone worked on my mazda but when i tried it using the same steps on...

i was concerned about my girlfriends vibe at 120K but i just called a very reputable pontiac dealership in the colmbus area and they said the timing chain is pretty much good for the life of the car unless you have problems with it thats the only time you should bring it in, or replace it!