Motorcraft FL-500S Original Version Oil Filter Helps protect against engine wear by screening out abrasives, such as carbon, sand, dust and bits of metal before they can get into your oil Pressure-relief valves help minimize the chance of contaminated oil circulating back into the engine Pressure-relief valves also help maintain the supply of oil to the engine under extreme cold conditions or if the filter gets clogged Steel cases are ironed for a precise fit, fluted to ease removal and painted to resist rust Efficient filter media offers increased dirt-collecting capability and ability to capture more engine-harming particles