I came across this interesting oil filter comparison test. Here are the conclusions and the web site: Filtration: 1. Delco UPF 52 2. PureOne, Bosch Premium, and Donaldson 3. Purolator Classic, Mobil 1 Ext Perf. and K&N, Mann, Fram Extended Guard 4. Wix/NAPA Gold and Wix built Delco Duraguard PF53, Mahle 5. Ecore style AC/Delco, Supetech, STP, and Fram Extraguard 6. Denso, Honda, Hamp Construction: 1. Mobil 1 and K&N 2. Wix/NAPA Gold, Fram Extended Guard, Mann, Mahle 3. Purolator, Bosch Premium and PureOne 4. Denso, Honda, Hamp 5. Ecore style AC/Delco, Supetech, STP 6. Fram Extraguard Easy oil flow: 1. Denso, Honda, Hamp 2. Mann, Mahle, Purolator Classic, Proline, Fram Extraguard, Fram Toughguard 3. Mobil 1, K&N, Wix/NAPA Gold, 4. PureOne, and Bosch Premium 5. Ecore style AC/Delco, Supetech, STP 6. Delco UPF52 , Fram Extended Guard http://filtrationcomparisons.weebly.com/conclusions.html