I've been using one for a long time. Personally, I think it's not all that likely that it does a lot of good, but again for $30 for a lifetime part why not at least try. It's certainly not going to hurt anything. It definitely catches some fine metal (as shown in the pics), but that doesn't necessarily mean it reduces engine wear. It could be that those particles always stick in the filter anyways, could be that anything small enough to get through the filter can't really hurt your bearings anyways, etc. It's not a bad insurance policy though.
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