[Alan Roehrich]

We've noticed that the Delco filters are now VERY inconsistent in quality, except for the expensive PF-35L, the PF-932 (2 quart truck filter) and the PF-2232 (Duramax). We had problems with the PF-35L, we noticed a drop in oil flow, I don't have the figures handy. I am pretty sure I posted a description of the physical differences you could see between the good Delco stuff and the crap (which most closely resembles the cheap filters from "the zone", named after an oil treatment). We're using the Car Quest racing filters now, they're a Wix Racing filter, with better flow. The Napa Gold is also the same. The K&N is the same basic filter as the Wix as well.