Radiator - how often to service/flush, or should I?

[nookandcrannycar]

Originally Posted by esse10

If you haven't contaminated the system by mixing the wrong coolants or adding regular tap water you shouldn't have to do anything till around 150k miles or 7-8 years. But if it makes you feel better go ahead and replace the Toyota long life coolant. My 2005 Tacoma still has the original pink Toyota long life coolant after 145k miles and 9 years, no coolant issues, running like a champ.

^^^^^ This. In over 300,000 miles on my '07 Yaris, all I've had to do is add part of a new bottle of the 'Toyota Pink' that I purchased at a Toyota dealership.