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The small amount of magnetic sludge doesn't seem to be anything to worry about, it should be expelled at oil change along with the non-magnetic sludge of especially harder aluminium oxides that will exist in the oil from any fine oxided aluminium wear.
I use a standard BMW drain plug with no risk of the breakage that a poor quality aftermarket plug could bring.
For the N55, LL-01 works well, but it is no longer specified for the B58 in any market, needs to be LL-01FE 0w30 or LL-17FE+ spec oil.
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