Ford Super Duty Owner's Manual
Anybody come across anything interesting reading your owner's manual?
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The coolant test was really in case someone topped off the coolant bottle with the wrong coolant. Ford has switched from the Orange coolant to a new Yellow coolant that last even longer so I doubt a recharge is necessary.
Be careful with that, the older, 2012 trucks, call for orange unless the yellow is an approved substitute. And the coolant tests detect weak coolant and Ford sells a concentrate that you can add to boost the coolant concentration. Comes in a liter bottle
