I like this. But one thing I want to comment on is that you mentioned mixing Dex with other coolants.

Mixing Dexcool and Prestone Any Make/Model is absolutely fine, I did it in 2 cars and it's been running for 2 years that way... and my customers do it frequently.

What you do not want to mix is conventional GREEN coolant with Dex, that will become corrosive jelly and clog everything up. It happened to my dad's van at one of those quik-oil change places.. they saw the coolant was low and dumped green into the dex cool... next thing you know we have a severely overheated vehicle.