Originally Posted by dave1123

I think the major reason premixed coolant is not consistent in Ph is because of the water it's mixed with. Not everybody has the time or inclination to buy full strength coolant and mix it with distilled water, but that's probably the best way to go. I'm thinking about the years I've used hard wellwater in my engines without a thought! Luckily those were old Chevy trucks with brass radiators! I also remember when Corvette first started using aluminum radiators they had problems with constant leaks and early failures probably for this reason, lack of proper Ph balance. GM came up with pills that you were supposed to put in the radiators of Corvettes and Cadillacs to help with this problem. I have no idea what they were made of.

It all comes down to science, doesn't it? Just like the lead-free solder that is an electrical nightmare! Then there were engineering failures like the year Harley-Davidson decided to use aluminum wiring in their handlebar harnesses. Aluminum doesn't do constant flexing well!

Originally Posted by dave1123

If you really think it is, why does it vary so much in Ph!