Hmmm... good tip Mark. Maybe a good thing to use on a few gallons of oil, I've been buying good synethic oil every time they have one of those 5 qts + filter for $25-30 deals (vice $8/qt normally) but because I've got two oil burners in the stable (Axiom and VX) I have about a half dozen K&N and Mobil 1 filters and no oil to go with them.