time or mileage more important with regards to Motorcraft orange??

[dailydriver]

I have about 2 years and 8 months since the build date, and 17K miles on the factory installed Motorcraft orange coolant in my ST.

Does this stuff (or any coolant for that matter) 'wear out', and lose it's 'alkalinity reserve'/turn acidic quicker by time, or by mileage?

 

[Snagglefoot]

I believe that circulation will hasten the degradation but time is also a factor. How about 5 years or 60,000 miles, whichever comes first.

 

[FCD]

Being a full OAT coolant, that coolant isn't even close to needing to be changed yet.

OAT inhibitors deplete very very slowly.

Maybe test the pH every now and again just to verify it's still above neutral, but that coolant probably won't need changing for at LEAST 3 more years.

 

[Lubener]

Originally Posted by dailydriver
I have about 2 years and 8 months since the build date, and 17K miles on the factory installed Motorcraft orange coolant in my ST.

Does this stuff (or any coolant for that matter) 'wear out', and lose it's 'alkalinity reserve'/turn acidic quicker by time, or by mileage?

I go by time. You got another 2-3 years with your gold. I take my "green" coolant to around 5 years and never had a corrosion issue.