[fredjacksonsan]

I've used this product, it worked well and as advertised, without the harshness of motor flushes. www.auto-rx.com

and gtmud is correct - if you've changed all your fluids regularly, you shouldn't have a problem. I change my coolant every year and a half whether it needs it or not, and I have never had a corrosion problem or radiator failure in any of my vehicles.