if it is got a surface imperfection on it you can take a piece of 220 (and then 400 if you want) and sand it on a flat surface putting the sand paper on the flat surface facing up and then putting the washer between the sandpaper and your finger. I used the last washer in my Sentra for 140,000 miles with nary a drop of oil lost. Just no need to over-torque it!
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