5 ml in 15 litres of buffered coolant. Someone can do the chemistry but I’d say no way would that amount of acid ( and it’s probably not much stronger than citric acid) would bring that solution down to 5.5. Bogus pH strip results.
That would not materially affect the pH.Thanks everyone... I'm going to drain out a couple liters of the coolant and refill with the concentrate. I suspect that my initial way of "estimating" left me with a ratio of around 55% water and 45% coolant. The recommendation on the bottle is for a minimum of 50% coolant and can go to 60% coolant if live in very cold. I will then re-test with strips and a hydrometer. This will be quick and easy as the overflow bottle probably holds 4+ liters... I will let you guys know.
MR LUBE doesn’t know what it really means to measure the pH of water, especially distilled water. Such a measurement is nearly meaningless since you’re trying to measure a very small H+ concentration, and it’s a logarithmic scale. Unless your water is seriously contaminated it’s not an issue and can be ignored. pH and its measurement is often poorly understood and his comments reflect that.On an interesting side note the guy at MR LUBE said that you definitely can control the PH by changing the ratio, adding more water will get a lower PH, adding more coolant will get a higher PH. He mentioned that in his personal experience it makes a big difference where the water comes from. And that water (even distilled) varies greatly and often isbelow the normal water PH of 7. I will go back tomorrow and re-test (after the concentrate has had a chance to mix from the overflow bottle).