I've only had the drop-ins on my Z for a couple of thousand miles, but on my Mustang, I cleaned and oiled the filter every 5,000 miles or so. Granted, that was overkill on my part, but it made me feel better. I always make sure that the filter is completely dry after cleaning and not to over-oil the media. I believe K&N makes the claim that you can go up to 50,000 miles between cleanings for a box-type (stock) filter, like those found on the Z.
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