I use Amsoil myself. As said a few posts up you are most likely going to have to order it off their website. I don't think they sell them in stores and they have some type of distributor system setup that you have to go through even to order off the website. I had to find a distributor listed in my area, go their website, and then click a link on that one to get back to Amsoil's site so I could order. Only thing I can figure is that they do it so the distributor for your area gets credit or something but it kind of made me feel like I was ordering from Amway and not Amsoil. It was a weird process but I got the filter.