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Originally Posted by dunl
They're bad for any engine....they let it too much dirt.
If you use one, put a paper filter behind it and se how much dirt it catches that the K&N didn't.
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How about marine engines? 98% of medium sided (800-2400 hp) marine diesels have a oiled gauze filter. Not much dust on the ocean....
So they do have a place that is within standard long term use applications- but it is not on a everyday driver if you want what is best for the engine and you plan on keeping the car according to nearly all well informed individuals.