Mike, it would be better yet if you had a product that changed color to let you know when it should be changed. Identify when the water content was above a certain point.
If I remember correctly there are some test strips to identify when it should be changed, but I'm not certain that's correct. I could be thinking of coolant PH straps.
I do know there are millions of vehicles that are on the road that have their born with fluid still in the system years past thev3 year suggested time frame.
__________________
Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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