look what somebody posted on a local car board:

Quote:
There are only a few manufacturers of oil filters out there, (3 maybe 4). a Fram & a Wix filter are made exactly the same, Fram just adds their own color/label and the "sure grip" top. If I can remember all the manufacturers I'll list them, But Champion Labs, & Honeywell Inc. make more than 50% of oil filters.
out of a batch of 20,000, maybe half will end up as "Napa", the rest might be pennzoil,valvoline, fram, firestone, jiffy lube, A/C Delco, etc......