It's not gonna hurt anything as long as it's not way past the hash
marks. Just a little past is fine. I drove my T-bird for over a year with
the fluid WELL past the hashmarks and she was fine. I did recently service
the trainy and everything looked good.
Common wisdom has it that if it's significantly over you are risking foaming
in the fluid, resulting in malfunction or even damage. I would remove the
excess. Get one of those tiny $10 drill driven pumps and use it to suck some
fluid out through the dipstick tube.
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