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Brake fluid question:
I'm about to completely flush and change my brake fluid on my '05. Ford specifies DOT 3 in my owners manual and I've been pretty strict about using factory specified fluids everywhere in the truck so far. My question is this: is there any harm in using higher grade fluid like DOT 4 or 5?
I'm a little surprised that they don't specify at least DOT 4 in this day and age for a truck that is rated to tow 6 or 7 ton trailers down long mountain grades, I would think that a higher boiling point is always a good thing. In my old 7.3, I ran ATE Super Blue racing fluid that I had for a track car, it has the highest boiling point of any fluid. Overkill maybe, but it's always nice to have a large buffer.
Sorry for the long post, but is there any reason not to use this? Why does Ford only use DOT 3? TIA.
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2005 F-250 4x4 SC SB 6.0 stock 
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