well it's happened,just found this on NTPOG,i know the pics are down but i copied the quote, used to be bosch and stp were the closest filters you could get to the original high quality factory filter,now they have started making them off shore out of cheap parts, i was at the H.A.M.B. reading another oil filter thread and i deceided to look for the NTPOG thread,and found this new info.they reccomend the wix over there at the HAMB ,a lot of serious old school engine guys,What Not To Use: Bosch, STP, and Wal-Mart Supertech
While both the STP and the Bosch filters were at one point good filters, they are now manufactured off shore of sub-standard parts. The filter assemblies tended not to have even pleats and generally less media than other comparable filters. There was also a complete lack of a well functioning by-pass valve. With most filters there is an obvious and discrete by-pass valve, but with these filters the can spring and the by-pass valve are the same. The real issue is that in order for the filter to properly by-pass the entire filter assembly would have to move down during use. That is actually not possible with filter assembly properly seating into the anti-drain back valve. This means that the by-pass will effectively never work. In the center of the of picture below you see the filter assembly (top) and the can spring/by-pass valve (bottom). (The can spring / by-pass valve would flip over and into the filter assembly.)
they are the same way we are about fram,they suck, but now that the bosch has gone crap we are out of luck. other then the wix
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