dot3 or dot4 brake fluid 2001 Dakota

ChrisPerry said

Dot 5.1 is compatible with dot 3&4, as it is polyethylene glycol based. Dot 5 is silicone base fluid and it is not.

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DING DING DING!!! DOT 5.1 and DOT 5 are completely different. DOT 5.1 is a new fluid type that actually performs better than DOT 3 or 4 from a wet boiling point prospective.