Don`t oil the K&N "."....they only filter seagulls and larger birds like crows anyway so leaving the oil out won`t affect its filtration performance much

On road in perth you don`t see much fine dust anyway(not enough to worry)...

Apexi dry "power filter"(panel type std airbox fitment) is the way to go if you want somthing good ...factory filters are good enough for sub 300hp performance as well.