Comments:
The Bosch appears to be of excellent quality. The Bosch, Mobil 1, and STP appear to all use identical materials and construction, with only the Mobil 1 having a different filter media (appears to be coated). The pleat seperation/uniformity does not appear as good as the Mobil 1 or STP filters, though this may be a manufacturing issue (I may have gotten an odd one). The Bosch, Mobil 1, and STP bypass valve utilizes a stiffer spring than any of the others and a rubber seat/seal which should help prevent leakage. This filter is well made and looks to be an identical (though more expensive) alternative to the STP.