Originally Posted by KatoomUSA
Im no expert Ive had a 2010 R for two years last year I started to see a little crud deposit in the coolant overflow bottom that turned out to be a sandbox starting to gather.. Ive flushed mine for the last two oil changes and will do one more for good measure its not that difficult just time consumeing the knowledge in this thread is awesome.
I flushed mine last weekend with 2 gallons of distilled water, the engine running and the water pump bleed screw open. Engine was fully hot and I had a large pan underneath to catch the original fluid. There was absolutely zero sand or crap in my system, I guess I'm one of the lucky ones. I replaced the stock coolant with straight Engine Ice and burped the system properly. Going to install a colder thermostat next.