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Hmmm, I am curious to know the answer aswell.
Chances are your filter is simply not as effective anymore because the activated carbon is probably "saturated." Or maybe I am am confused and it does not work that way at all...just a guess. And from my fishtank cleaning days, activated carbon can only go through so many washes/filter cycles.
I skipped buying the 60 dollar filter and instead bought the engine air filter on my last trip to the dealer.
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. ------Family Garage
'09 - Black - BMW X5 4.8i
'08 - Black - BMW X5 3.0si
'04 - Black - BMW X5 3.0i - SOLD
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