I wanted to see if the 2008 QS filter in that study still compared to the ones i bought today.
So i got the can opener and compared a Fram PH3387 to a Quaker State QS3387.
Both are marked "made in USA"
Fram is distributed by Honeywell
QS is distributed by Sopus...I dont know if they are related.
EDIT: internet search reveals Sopus is Shell Oil Products US. Not related to HoneywellIf they were made by the same manufacturer, they are not built to the same standards.
Fram weight 212 Grams
QS weight 228 Grams
open them up and you can see the difference right away.
Fram has Cardboard endcaps still
QS still has solid metal endcaps
Looking at the filter cartridges...
Fram has unorganized, poorly assembled filter media with 39 pleats
QS has well assembled filter media with 58 pleats
Rubber gasket on top is loose on the Fram and fitted on the QS.
Looking at the construction of the filter carts, the Fram is a doughnut allowing oil to go in and around the cartridge.
QS filter is a closed unit forcing oil to go thru the filter media.
Probably builds more oil pressure too.
All in all, I think the QS filter is better. So when it goes on sale i scoop them up...espesially since they fit 2 of my cars