I'd never heard anything about that until this thread. I can't say from experience that it wouldn't happen but I do know that the lack of sludgy buildup was one of the other benefits that Evans claims. It is not supposed to break down and is supposed to last (without needing changing) for the life of any vehicle it's put in. I do remember seeing someone online showing photos of an engine they'd torn down after using it and the water passages really looked clean.
Most people don't change antifreeze as often as they should (if ever) so if their claims are true it would save a person a lot of money over the course of the life of their car. I know that a lot of over the road trucking companies have been switching to it.
Only time will tell if it doesn't break down but for now we're really pleased. It took awhile to get used to the temperature increase that we saw and I was really concerned at first. It wasn't until I found that my engine could run at 200' without pinging that I calmed down. With the glycol mix we were already running on the edge of detonation issues at 190'. I've heard that the optimal temperature for power efficiency is theoretically around 200' anyway. I don't remember where I'd heard that but if it's true then it's another point in favor for using the Evans.
