Oil filter

Originally Posted by JoeyD

^ Used is a very subjective term. It's is technically used the second you turn the ignition over.

It's not $8 for a K&N its about $14 just to be clear.

I often let my Mazdaspeed6 go two changes before changing the filter because it was a cartridge type and a PITA to change. If a piece of metal is lodged in your filter theoritically it will stay there. But more importantly if you have a piece of metal in your filter your engine is coming apart somewhere.