Why you Should Change your Oil drain Plug Washer
There is a copper washer on your engine's oil drain plug. This copper washer gets mashed into place when the drain plug is tightened, sealing the drain plug against the oil pan. Once it's mashed into place once, it gets "work hardened." Once it gets hard, it will be difficult to get it to seal again. Sometimes people try to compensate by overtightening the drain plug. BAD IDEA! The steel threads on the drain plug will strip the aluminum threads on the oil pan. Don't force it, just get a package of new washers and change the washer every time you drain the oil. They're cheap.
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