Ok i put some of this in my expansion tank. Nothing really happened to start with. After i used the car a couple of times the temp came down a small amount. The after a few more runs its come down some more. Each time i use it it seems to take longer to make the dials rise and the maximum temps are less. Any idea how this stuff works, and why it takes so long to get an effect. I heard it removes hot spots from the engine, but why doesnt it work when you add it? Im really happy as my max water temp has gone from between 1/3 and 2/3 to now below 1/3 and my oil temp is now at 90, down from 105.