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I don't know what Alfa uses normally, but autoparts stores generally have a selection of copper gasket washers. The price is not more than $.25 each, so I would suggest estimating the size of the drain plug and then buy one yo think is the right size and a couple of sizes up and down. 5 or 6 different size washers would cost less than $2.00, then next time you do an oil change, see which washer fits best.
 

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I think so. I've never seen a drain plug that did not require some sort of gasket to seal, except on diesel engines used in transport refrigeration. They used pipe plugs with a tapered thread. If you have a machine thread, it should have a gasket.
 

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Just for information purposes, if for any reason you can't get the nylon washer, you can use copper. The secret to copper is not to try to tighten it tighter to get it to seal! If it doesn't want to seal, take it off and anneal it. You heat it with a propane or butane torch until it is just short of red hot (cherry red is ok, but not necessary). Let it cool or quench it, and the copper gets soft. Now it will crush and seal without having to tighten it so tight that you damage aluminum threads.
 
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