Accurate way to test Coolant/Antifreeze 50/50 mix
 

Does anyone ever use the Prestone Antifreeze Tester? Or the Peak Tester?
I just flushed my 2005 V10 and looking to make sure that I have a good 50/50 mix.
Is there a more accurate way to test it?
Thanks ~Gage~

I use the Prestone tester. Never had any issues.

Ditto! What he said....

http://www.acehardware.com/graphics/...E-997942dt.jpg

Thanks guys....
Ok so heres what I found with the testers I used the Chaslyn Small Anti-Freeze Tester, & the Prestone one. The Chaslyn I got all 5 balls floting but the fifth one not as high as the others, the Prestone I got a +268 -45 reading on it.
Also I need to top it off about a 1/2 gal? was going to mix the Motorcraft Coolant and Distilled water 50/50, but the Motorcraft I have is a open 3/4 full gallon thats about 5 years old, its been in sitting in the truck box all that time is it still good to use?
Also I tested it by draining about 1 cup, and by the expansion tank.
Thanks ~Gage~

Gage, I would test it with your testers. See what you get. Most of what I could find using "coolant shelf life" said 1-2 yrs and some said 5+ yrs. I would say that if you can afford to get some new then go that route and maybe save this for an emergency. If you can't afford new then add it.

Thanks Ya I still have a left over new gallon from this flush, but wanted to keep that as a spear. I didnt want two open 1/2 gallons.
Thanks ~Gage~