GReddy Magdrain Magnetic Oil Drain Plug M20 x 1.5 - Subaru WRX 2002-2014 / STi 2004-2020 (+Multiple Fitments)Magnetic oil drain plugs in general, are a simple way to help remove harmful metallic elements floating within your oil. This will improve the overall lubricating qualities of the oil, and it will help prolong the life of your engine. Features: Features a powerful 5000 gauss neodymium magnet on top Helps reduce the amount of abrasive materials in your engine while extending the life of your engine M20 x 1. 5 thread pitch *Photos for marketing purposes