Quote:
Originally Posted by zx9rmal
I'm having myM6 fluid changed today. What is the reason for the level to be 1/8 below rather than at the bottom of the fill hole?
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The fluid expands when hot and will get ejected via a vent at the top of the trans. In my experience this only happens with track use. Once enough fluid (a teaspoon here and there) is expelled it stops.
So if you fill to the fill hole, let it completely stop dripping before you put the fill plug back in. After that you *may* see some small puddling of trans fluid until it burps out the surplus, which is harmless. This only if you get the fluid really hot. Hot = 180-200F.
IMO the 1/8" below the fill hole is to prevent the dealer visit if some spirited driving is done and the owner happens to notice a small drip under the car.