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It's a good practice to use a new "crush" washer when re-installing drain plugs. The washer crushes under mild torque and provides a good seal. It also helps prevent over torquing the drain plug, which can lead to RNS (rounded-nut syndrome). My indie mechanic includes crush washers when I buy Mann filters from him. They are also available from many auto parts stores, made of aluminum or copper. The counter guy often gives them away rather than look up SKU #s. I'm guessing the drain plug washers are 18mm.
Chris in NE FL, '94 945 w/164K
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