Pardon my ignorance on the properties of a magnet, but csnow are you saying that I don't put the magnet on the part of the plug that is inside the oil pan, but rather stick it to outside of the plug after I have screwed it in?? If that is correct, are you sure that a rare earth magnet will be strong enough to magnetize the whole plug so metal shaving will stick to the other end inside the oil pan? And if it is, then wouldn't it also magnetize the area of the pan around the plug too, so the shavings wouldn't necessarily be isolated on just the plug? Thanks.