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· Everything in Moderation
2006 CR-V EX, 5MT
11,988 Posts
It's the same stuff you breath in everyday.
Actually, many intake systems routinely suck in a bit of oily vapor from the PCV (crankcase ventilation) systems. Depending on the flow of air across the filter housing, this could account for the pattern in the original post.

Us frugal Gen2 owners are lucky, the conical filter on ours can be repositioned to collect the dirt on the other side. :rolleyes: 🤣
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