Fuel filter is a snap... I assume in your question your asking how often for the fuel filter? The owners manual says 15,000 miles but I change mine at every 5,000 mile oil change. With this new ULSD some of the crud from the tanks is getting washed into the fuel. You will have happier injectors and better fuel economy if you change it more frequently. Genos sells the Filters for 14. 00 so not a lot of $$$$ for a healthy engine. . The procedure on how to do it takes about 10 minutes and if you do a search you can get all the steps!! If you want them again, PM me and I would be happy to give them to you...