The Honda dealer had changed the filthy engine air filter that originally came with the car when it was at only 14,000 miles. Today I inspected that 2nd filter (now at 10,600 miles). It was definitely quite dirty already, but what caught my attention was a very very thin, very fine white dust in the upper part of the filter housing (downstream of the filter). I thought going OEM on air and oil filters was best but now I'm not so sure.