Yeah, if you go to cold climates, a 50% mix is preferred. But no more than 70% maximum. When I lived in sacramento, I put in TWO quarts of anti-freeze, one bottle of Water Wetter, and filled the rest up with distilled water (on a 10.5 quart system). Up here in Idaho it's colder so I need four quarts. Unless you get below zero F, you probably don't need more than 50% mix. If you want, you can get the "Super Radiator Cleaner" stuff which requires 6-10 hours of driving with the cleaner in the system, then drain & flush. The less a/f in the system, the better cooling will be, and the Water Wetter provides the lubricity additives required. You can trun straight water and Water Wetter if you won't ever get below freezing. The reservoir doesn't clean well, if it's really dirty, replace it. As to hoses, well, I don't think it will matter if they are replaced before or after flushing. Same with the t-stat. Oh yeah - 'stat removal is only required for the citric acid flush, not for the McParts flush.
