air filter service interval

It needs to be replaced sooner than is written in manuals... 40.000km.
Here is (even over lightning exposed) picture of filter at 20.000km.
2014-11-14 19.02.45.jpg
and here a new one:
2014-11-14 19.00.46.jpg
if you simply compare them.. it looks like dirty is still OK:
2014-11-14 19.03.52.jpg
 
I clean my BMC filter with compressed air when-ever I change the oil (5000 km). I wash and re-oil the filter every 2nd oil change (10 000 km). Over kill, maybe.
 
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