I take your point about reduced airflow once the mesh has a coating of muck and oil deposits on it. But surely on the side of of broken parts bouncing around then that is the idea of the mesh to stop them before they do go into the engine, hopefully youwill notice the reduced torque and investigate the problem, finding the broken pieces en route so to speak. Maybe not a completely well thought out plan to start off with, although i think it would last quite a while.....50k, note so sure about that, but as i have only 11k left to the "dreaded engine failure" of 100k then could be worth a go :-)
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