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The threads do not seal anything, it is the head of the plug sealing to the sump with a proper aluminum crush washer (you DID use a new one, didn't you???) as a gasket. Next time you change oil, try a new aluminum crush washer with some gasket compound (not silicone) on both sides of the washer. A machine shop could machine a land for an "O" ring into the plug, I suppose. My old GMC truck has a great sump plug gasket, with a rubber face bonded to the washer on both faces, and it has lasted for 15 years without a drip.
Alan L. in BC
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Alan L. in BC, '02 RS (Black), '69 TR6R, 3 others
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