I recently went on one of the toughest rides I've ever been on and my bike overheated several times. I've had an '06, '07 and now the '12 WR450. Never had a problem with overheating before this ride. It was a constant climb or descent on a very narrow singletrack on the side of a mountain. Many times, one little slip could send you for quite a fall. The steep dropoff plays havoc with your mind and I was riding very slow.
My question is, what coolant and/or additives do you guys run to make the bike resist overheating and boilover? From my experience with cars, guys would run water wetter to keep things cool. Anything like that for our bikes?