Another part that we like about the Bulletproof Diesel oil upgrade is the additional port arrangement included with the system. Thanks to additional pressure and return ports, the system makes it super-easy to add upgrades such as a gauge or auxiliary cooling unit. We took advantage of this opportunity and added a bypass oil filtration device from Amsoil. A bypass oil filter continuously filters a small volume of engine oil whenever the engine is running. Think of it as an automatic oil change every time you drive the vehicle. The bypass filter shown here removes impurities down to 2 microns and leaves your oil the color of honey.