Evans has plenty of freeze protection. Rated to -40.

Expensive. But long term savings because (in theory) it's permanent. Unless you crack the system open for something else you'll never need to replace it again, compared to the 2 year program with regular green stuff.

Of course if you crack open your system you're gonna lose some and have to buy more.

There's no time like a fresh build when everything is new to put it in. But once you add anything else to the system, even for just a test run, you're in for a heck of a pre-flush procedure...