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It's corroded in because it's a steel plug in an Ali housing. Try soaking it in WD for a few hours and try to remove it when the engine/box are hot, very hot, as Ali expands more than steel. Also I think it's a tapered thread so you can't drill it and hope it will spin through, if you get stuck drill it oout and use a stud extractor (LH thread) to get a grip on it.