depends on the type of filter. some you just use soap and water to clean and no oil... others use a spray on oil that is water soluable (so it can be cleaned using soap and water) I use a light solvent on mine and no oil but am eventually going to change them to the k&N type that uses a spray on oil... best to use an owners manual to see what they require. some are probably throw away and replace after getting dirty.
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