[77newell]

Brad: there is more to the test strips than ph, a proper test strip will also indicate the where your coolant is in overall chemistry that's needed for coolant to be effective. Yes, coolant strips can go off which is why when I get a good set I store them in a freezer. If the test strip says you are OK you are very probably just fine. One thing the strips won't show is particle contamination, but a filter can minimize that risk.

If you decide to change it out you will need about 25 gallons of diluted coolant, that's what both my 6V92 and 8V92 powered coach took. 13 gallons of concentrate and 13 gallons of distilled water worked just fine.