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The Oil filter itself isn't doesn't keep your engine oil clean 100% of the time. For one, maintenance schedule times are getting ridiculously long. Also, the oil filter can only screen the oil between the pan, oil pump(s) and to the filter housing. The reality is, engines run and wear; shavings/particles build up in the system and flow throughout the engine because everything is AFTER the filter. In turn, this means all particles that happen to get into the engine oil from wear, will not be filtered until it's next pass around when it falls back into the pan, and then back up through the pump and through the filter. Also, depending on how often and how well you follow proper maintenance schedules, residual oil/gunk build up will happen AFTER the filter as well, throughout the engine, that little screen mesh prevents chunks of gunk build up from getting jammed inside of the vanos units. Considering how small the oil passages can get, it's the engineers last chance defense against all the odds the engine faces with oil contamination.
I hope this makes sense, haven't had my coffee yet...
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