I have 3 cars presently (VW, Lotus, and Porsche) that use cartridge filters and have had some in the past as well. I much prefer them to spin ons, especially when they are mounted top side for easy access. I have used Mahle, Mann, Fram Ultra, and Wix cartridge filters. I read bad things about the Wix filtration level so I stick to the first three now. If Fram Ultra is available in the fitment I use that as I have found it to be equal to or superior to the German manufacturers while being easier to locate and cheaper here in the USA.