Coolant system flush. Can I use Peak or similar?

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Robert Gift

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Denver, Colorado USA
We're all-volunteer emergency medical transport.
I plan to flush the 2008's entire cooling system.

Must I get to a Ford dealer and buy expen$ive Motorcraft Premium Gold Engine Coolant? (Yellow-colored)
Or would our nearby Wal-mart or local auto parts store have something suitable and cheaper?

Owner's Guide directs that distilled water be used.
Would any premixed 50/50 coolant be acceptable?

Thank you.
 
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