Honda uses industry standard brake fluid, per the specs in your owner's
They do not use a proprietary brake fluid.
That being said, there are plenty of reasons to use Honda-branded parts
and fluids. Not necessarily brake fluid, but others.
Brake pads, for some reason come to mind.
US law mandates that an automaker may not tie a warranty to the use of the
automaker's own parts and supplies. But the automaker /may/ tie a warranty
to the use of parts and supplies that /meet the automaker's specs/, which
in this case is DOT3/DOT4.
Honda's specified 3-year brake-fluid replacement interval is based on the
use of Honda-branded fluid. Use of other fluids is beyond Honda's control
because aftermarket fluids may or may not contain the same level of
lubricants and other protective chemicals as Honda's OE fluid. That's why
they'd /prefer/ you use their own branded fluid.
Personally, I use aftermarket DOT3 fluid, the house brand of a local auto
parts place. But then I also replace the fluid every year, so I'm insulated
from most of the deficiencies of the aftermarket fluid.
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