I have a 2002 RX300 and want to change the coolant. After reading some other posts on the topic it looks like the way to go is to stick with the Toyota coolant. What is the service interval and how should the fluid be changed; drain and refill?; flush with a garden hose?; back flush with Prestone flush & fill kit or equivalent?? I have pretty hard water in my well and I'm thinking the extra minerals in it can't be good for the cooling system. I was thinking of buying a few gallons of distilled water to fill it with. Any help or advice is appreciated.
Alex