My car was leaking oil during my recent roadtrip. It never crossed my mind that the oil filter was leaking. Once I jacked the car up, I found out that the nut that is welded on top of the oil filter was leaking oil. I lost almost half of my engine oil before I notice it was the oil filter. And no, I did not over-torqued the bolt, I did not even use the bolt to tighten it. I would never use any K&N product at this point. I had one of their high performance air intake in my car, it actually reduces some of my car low-end torque. The noise produced by the air intake is also unbearably harsh and cheap. AVOID using this filter at all costs.