I'm pretty sure that all anti-freeze is Aluminum compatible now-a-days, if you're really worried head to Crap and Scap and pick up some pre-mixed coolant of your favourite flavour. It should be mixed right. Be warned about cheap testers lol I have one that says -40 with water in it, But i went overkill and bought a Snap-On tester for about $30. And once a year is plenty to change it. My Scrammy went 2

 

im pretty sure that most 50/50 mixes are good down to -40 f thats what most of the car mfg always used. ive never had any problem w/ any of my vechicles/motorcycle/ or atvs w/ this mixture and it does get down to -20 around here once in awhile.