Originally Posted By: Bottom_Feeder
Originally Posted By: demarpaint
Originally Posted By: 63CadillacBill
In my opinion the Wix is a quality filter!
It is.
Is it made well? Yes. Does the XP filter well? Not really.
I wish there were more information available on filter performance. There is a good article on the Noria web site from Machinery Lubrication Magazine in 2003 titled "How Flow and Vibration Affect Filter Performance -Inside and Outside the Lab" This article and various SAE papers and work done by Oklahoma State University have shown that standard filter test procedures do NOT always reflect real world filter performance. Such factors as variable flow rates, viscosity changes and vibration all affect filter performance and are not reflected in standardized tests. About all that a consumer can do is to purchase well made filters and rely on the integrity of the manufacturer to provide the best combination of performance. I personally use Wix manufactured filters, including the XP for extended drain intervals. Does anyone on this site have access to a better source of information?