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i personally have 106k on my 08 128i, i use Mahle air and oil filter (it's about $25 for a set or air and $10 for the oil). also i do oil change every 6 months (so about 7-8k miles). spark plugs/differential fluid/manual trany fluid/ and coolant flush every 50k. Cabin filter every 30k.
(to answer your question, what i usually do is clean it every 4-6 months and at around 15k interval i go with aftermarket Mahle fresh set of filter. to be honest with you, just simply cleaning it with a brush does a good job and you can arguably run the same filter for 30k but i just simply don't.
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