I know there has been some discussion in the past regarding the quality of oil filters but I never realized what a BIG difference there is. We have been running a Fram HP6 on the race boat and recently dissected one and compared it to a Wix 51222R. Man what a difference! The quality of the materials used and the construction was night and day. The housing was substantially stronger and the filter material volume was greater in the Wix...
The Wix also has a "turbo" flow design that "spins" the oil though the filter helping to separate particulate from the oil... The Fram and the Wix are also the about the same price...
If you can't find Wix brand, Napa filters are made by Wix. Just drop the first number off the Wix number and that is the Napa number. They are exactly the same filter...
S&S