[calitundra]

I was changing mine this weekend and bought the Prestone dexcool. After flushing and starting the engine many times I soon realized that I could not get all the antifreeze out. I was not sure if this would mix ok with the Toyota antifreeze. I just decided that I would use the Toyota brand. On the Prestone bottle it states that if you can't get all the antifreeze out then you will not get the 5yr, 1500,000 mile use. I know in my tacoma I had some 70,000 miles and 5 years and when I pulled off one of the heater hoses, there was a bunch of white junk coating the hose. I used Prestone heavy duty cleaner and then refiled with good results. I think in the long term it is just easy and cheap to change the fluid every 2 years.