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96 Legacy OBW, EJ22 swap, 2" suspension lift, 215/75r15, HIDs, 06 WRX interior swap
341 Posts
i feel your fluid is breaking down way too fast. gear oil in most cases should be good for 80-100k and shouldnt be pitch black even then.

is you car AT or MT? if its AT could there be tranny fluid contamination which could look black and would definitely thin out gear oil.

i do mine every 50k just cause and its an amber color at its worst.
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