Bull. This just isn't true at all. If it were then you would see some of the top pilots in the world burning up their engines, because they fly 15% Cool Power. Trust me on this one, you can come look at the side of my planes after I fly them and you'll find PLENTY of unburnt synthetic lubrication all down the side of my plane!!! I've been using 15% Cool Power in all of my planes (except my YS engine, which gets 25%) for years now and have never had a lick of trouble. Heck, my OS 52 Surpass in my Slow Poke has 400+ flights on it (almost 60 hours of operation) using nothing BUT Cool Power. So I guess you can say that it does a pretty good job of protecting your engine.

If you want to know the truth, flying one flight with your engine too lean can do more damage to an engine than anything else that is ever done. This is what ruins most engines, pilots trying to squeeze and extra 100-200 RPM's out of the engine and then running it too lean. The engine doesn't have enough fuel to keep it cool and it overheats and burns up. Run your engines rich and they'll last you forever, run it too lean once and it's history!!

Hope this helps

Ken