I recently bought a couple of K&N filters and fitted them. After about 1,000km there was a CEL resulting from the mixture going out of range on one bank.
When I checked I found one of the filters had so much oil it was draining out into the filter housing.
I cleaned the housing, intake hose, both MAF sensors and put the stock filters back in, then had the Nissan dealer reset the fueling.
I've cleaned the filters and will lightly oil them when they're dry but i'm pissed off with K&N for being incapable of doing such a basic task correctly.
I bought a K&N filter for my other car[i20N] but returned it because the manufacturing was so bad the adhesive used had compromised the effective area available for the air flow.
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