Not Ranked
Sorry for hijacking the thread, and as an engineer by training I should have known better and been more specific. I was referring to the dry boiling point. DOT ratings are based on wet boiling points and in that regard DOT 4 is superior. Motorcraft DOT 3 has a dry boiling point of 500F vs 460F for DOT 4. Being in AZ with little condensation and that we change fluid pretty often the dry spec is probably more relevant but then again I am not sure 40F makes much difference at least given normal driving conditions!
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