I am on my third oil change with the car at this point since buying it this past August 2017. I have used Amsoil 5w-30 (ASL) product code for my oil changes. This has designed into it a cleaning agent, but like I said, my only option for a cartridge filter is a Mann unit. There good, but no where near the best. They can go a max of about 7k miles. I'm looking at adding an Amsoil BMK21 filtering kit that will filter down to 2 microns. At the same time it will increase my oil capacity by about 1 quart as well.