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I tighten to maybe 15ft-lb tops on my normal steel drain plug. New crush washer and I also put a bit of hylomar on the threads (non-curing RTV) to prevent thread leaking as well as acting a bit like loctite to the drain bolt. It cleans off easy with brake parts cleaner and a brush when doing an oil change.
I wouldn't use an aluminum bolt though in any case. Stick to steel. Aluminum means that the magnet is glued in place, and that also means it could come loose.
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