The air filter has visible oily grime underneath?

Tiny
SHAHBAZABD
  • MEMBER
  • 2020 HONDA CRV
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 50,000 MILES
I recently replaced the air filter and after running just 5,000kms, the air filter has visible oily grime underneath. Is this normal or should I be concerned?
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Monday, December 25th, 2023 AT 1:13 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi,

I don't feel it is normal. In this case, I suspect the engine's crankcase pressure is higher than normal and causes an oil mist to make its way through the PCV (positive crankcase ventilation system) into the air filter.

I attached a pic below showing the location. There is a hose between the PCV valve and the air intake. Disconnect it and inspect it for excessive oil in the hose. If there is, I would suggest making a record of it with a dealer. It could indicate an issue with the piston rings.

Let me know what you find or if you have questions.

Take care,

Joe

See pic below.
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Monday, December 25th, 2023 AT 9:49 PM

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