Originally Posted by Squareleft
If your antifreeze is ethylene glycol based then its fine to mix with others that are the same however things like dexcool will turn things into gel or something other. Chemicals react in mysterious ways.
Motorcraft Orange coolant is OAT (organic acid technology) based for extended drain intervals, and it doesn't mix well with basic green/ gold coolant in terms of the protection, nor the relationship to the metals inside the cooling system.
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