I work in a lab and have the opportunity to check the ph of my coolant. An acidic pH is one indicator of spent coolant, as it has lost its ability to buffer.
Honda 50:50 coolant has a pH of 7.9 according to Honda MSDS. I follow Honda's recommendation for coolant change which is 5 years/60,000 miles after the initial factory change. I haven't experienced a problem. However, I would like to measure the pH of the coolant, pre-summer and pre-winter, to give myself a little peace of mind. I would also check the specific gravity with one of those inexpensive testers. I am not that concerned to send out a sample for analysis.
A pH of 7 is neutral and in need of change but at what pH is coolant spent?
Honda 50:50 coolant has a pH of 7.9 according to Honda MSDS. I follow Honda's recommendation for coolant change which is 5 years/60,000 miles after the initial factory change. I haven't experienced a problem. However, I would like to measure the pH of the coolant, pre-summer and pre-winter, to give myself a little peace of mind. I would also check the specific gravity with one of those inexpensive testers. I am not that concerned to send out a sample for analysis.
A pH of 7 is neutral and in need of change but at what pH is coolant spent?