At least the one I had in my bike was thin enough to start leaking from a superficial scratch. Either they are thin or their quality control sucks.
Not sure what you mean by not exactly what they were designed for? Riding anywhere even on street you can expect some loose debris. It's one thing if your oil filter gets punctured rolling down the highway at 60mph, but my situation was slow speed in a hard packed gravel parking lot. My bike even has a skid plate which blocks off almost the entire front and sides of the filter. Anything that could have hit would have been tiny and shouldn't have had enough energy to puncture a normal oil filter, but it did on my Bosch filter.
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The shells are made from mild steel, everyone I've ever seen is made from mild steel. I've opened a number of them from cars, trucks and bikes. I'd be willing to bet that Bosch, the world's largest supplier of automotive components in 2011, founded in the 1800's actually knows how to make a quality filter. You didn't do a test to see if Fram or Wix would have done the same, nor did you measure the thickness of the shell and compare it to others.
You blame quality control, yet you don't know that filter was any thinner than any other filter. How many reports have there been about "pebbles hitting bike filters and breaking them"? Is this a common thing? I've never had that happen to me.
How hard would it have to hit to not only bend the mild steel, but to bend it to the point of failure? How much thicker is the Fram or Wix oil filter?
If we take 100 random filters, open them and compare the quality and thickness of the metal, would Bosch actually be thinner?
I actually have a BS in management science. I've done quality control systems for some of the largest companies. Suggesting that because you had one problem with one filter, that some how those filter's are "paper thin" without any analysis of the actual filter is just crazy. I don't know what you hit or what hit you, but concluding that Bosch make paper thin filters just doesn't have any sound logic.
It's amazing how much bias people have. Logic just goes out the window.
BTW, you don't have to buy any Bosch filters, I'm sure you feel much safer, but your logic that concludes Bosch has paper thin filters doesn't hold water.