今天洗完車趴下去發現洩油螺絲附近的油污不太正常
里程 1w km
曾經爬文有建議洩油螺絲上的銅墊片(? 要換三次油就要換，可是我都沒換過
請問圖中的髒污是正常的嗎？
謝謝
http://i.imgur.com/HRWVdo1.jpg
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