K&N heavy-duty wrench-off oil filters have a one inch nut making removal easier. The thicker canister increases burst strength while protecting against pulsation fatigue. The micro-glass media has very good cold flow characteristics while providing excellent capacity and efficiency. These oil filters have a premium HBNR base gasket for sealing, a silicone anti-drain back valve and a dichromate plated backing plate for corrosion protection. This heavy-duty oil filter was specially designed for a high compression turbo diesel engine's tight tolerances.