never had a problem with oiled K&N.. but I follow instructions :lol:
I currently have them in; 2007 CJ Lancer, 2009 SAAB Convertible 9-3, 2004 Moto Guzzi V11 Ballabio and 1998 Ducati 996
the Guzzi has been in since new (2004) and is oiled once every year.. it's a simple 30-min job and because Saab and Guzzi original filters cost over $60, they have paid for themselves many times over.
Don't be scared to use them, they're good, accessible.. but may not be as easy to use as a foam one, because you do have to re-oil after 25,000km