Why changing engine coolant more often than factory recommendation matters

Discussion in 'Fred's House of Pancakes' started by Georgina Rudkus, Mar 1, 2026.

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Georgina Rudkus Senior Member

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Sep 15, 2018

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Taylors, SC

Vehicle:

2012 Prius v wagon

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Two

CR94 said: ↑

High (>7) pH solutions are alkaline, not not acidic. Good coolant pH should be in the 8-9 vicinity. You're correct that acidic (<7) coolant is BAD news.
Are you checking your coolant pH?
When my car had a little over 100k miles on the (I assume) original coolant, litmus paper showed pH I couldn't distinguish from the color I got with new coolant. Out of an abundance of caution, I had it changed anyway.
Click to expand...

No, I just change coolant every three years.

#21 Georgina Rudkus, Mar 12, 2026 at 11:54 PM

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