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Just so someone doesn't duplicate my stupidity... the filter cap is like any screw (counter-clockwise to loosen), but when you first open it warm, it will take a whole lot more than the rated ~20 ft-lbs to open, and will have to be turned several times with a wrench before it can be removed the rest of the way by hand. When I put the fresh filter in I only tightened it to ~20 ft-lbs. Mistake. Didn't leak at all at idle or driving gently, but once the car warmed and I got into some boost, some oil snuck past the seal and made a little bit of a mess. So follow the suggestions on lining up the green markers, or tighten it down to the same level of pressure it took to get the filter off. Guess that's why the dealers or prep center screw that thing in really tight.
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