during the milling process a lot of spare metal is thrown around. they do clean the block after the milling, however stuff still gets left behind. the filter picks all this up, so it is good to do the change, definitely not necessary...
but the sooner you can get that metal out, the less chance of a freak mishap happening.
oil filters if they become too clogged can actually bypass themselves. you do not want this to happen with the filter full of metal.
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