I'm looking for some advice on flushing my coolant system. I had the system flushed at 30,000 miles, and I'm at 63,000 now and looking to get it done again. The shop that I talked to mentioned running a cleaning agent through the system instead of just flushing it out with water. I wondered if this was safe, as I've only heard of flushing the system with water. Furthermore, I'm looking at getting this kit from Crucial Racing and have it installed at the same time. http://www.crucialracing.com/products/coolkit.php
My other question is this, do I need to change the thermostat everytime I have the coolant flushed (every 30K)?
Thanks for the help guys.