Originally Posted by Duke2.6

I've always used "real" Bosch oil filters, but beware. Autozone has "Bosch oil filters", but they are NOT the same as the 72165 Bosch oil filter sold by Mercedes parts specialists like Fastlane for M103 applications. The 72165 has a bypass valve. The M103 "Bosch oil filter" at Autozone does not. I refer to them as "fake Bosch filters". They are apparently a cheap filter with the Bosch name that the Bosch aftermarket organization sells.

Makes it very confusing for car owners. Assuming you have a M103 do not buy any "Bosch filter" other than the 72165, and you can clearly see that is has the built in bypass valve.

Duke