Word of warning. I've seen first hand a complete brake system's rubber seals melt away after changing from DOT 4 to DOT 5. One thing to keep in mind is the boiling points of the brake fluid. Just because it's DOT 4, doesn't mean that it's the best DOT 4. You may get a better life out of certain fluids. I use Valvoline but the best numbers I've seen for DOT 4 was EBC race fluid.
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