Hello all! I have been lurking around this great site for a while, what a great source of information. I have been having some trouble choosing a filter, and hope you can help. I have an 01 Ford Ranger with the 4.0 SOHC V6 engine. The truck has 69000 miles, and gets Mobil 1 5w-30 changed every 5000 miles. I have always used the Motorcraft FL820s filter, but have considered changing. Like you, I want the best filter that I can get and have been looking at Pure One, Wix, Mobil 1 EP, and K&N. One thing that makes the choice so hard is the location of the antidrainback valve. I was told (at the dealer) that since my filter mounts vertically, the valve needs to be in the base of the filter. Only the Motorcraft and the Wix are of this design. Is the location of this valve really important? The folks at Purolator and Mobil claim it doesn't matter. I'm sure the Motorcraft is a fine filter, but I'd like to find out what is best for my application and drain interval. Thanks for your help!