The factory plugs have sloppy threads that have been known to strip out the aluminum housing, plus the magnets are weak in the drain plugs, the factory fill plugs and engine drain plug dont even have a magnet and also they take an allen wrench...8mm I think. The Sand Craft plugs are machined to a much closer tolerance on the threads so there is almost no perceptible thread slop, the fill plugs and drain plugs both have very strong magnets in them and they use a regular socket to remove. I like them because one magnet doesnt seem to be enough for the gear box with the amount of shavings that are on it at time of oil change, and the security of not stripping the threads in the case, and also the factory engine drain plug does not have a magnet and the sand craft does. The oil filter is not going to catch all of the very fine ferrous shavings coming from the rings, timing chain, timing gears and cam lobes and tappets. All wear from these components would be removed from the oil with the drain plug magnet that would otherwise circulate through the oil causing increased wear of all the friction points in the engine. Just my 2 cents.