Uploaded August 2026 | Updated September 2026, 5 days ago
Blue smoke from your Porsche, VW, or Audi doesn't always mean the engine is done. One of the most common causes is a failed Air Oil Separator (AOS) or PCV system, and today we're tracking the problem down on my Porsche 996. Then we're going to see if we can replace the AOS without following Porsche's factory repair procedure.
If you've searched for Porsche blue smoke, Porsche AOS failure, Porsche Air Oil Separator replacement, VW PCV problems, Audi PCV failure, crankcase ventilation issues, or excessive crankcase vacuum, this video will walk you through the diagnosis, explain why these systems fail, and show a different approach to the repair.
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Electric ratchet ~ amzn.to/2FydxMS
Magnetic tray ~ amzn.to/2FEpQ6g
Basic hand tools ~ amzn.to/2GnjF7K
Box wrench set ~ amzn.to/2FzoJch
ScrewDriver set ~ amzn.to/2FEjcgd
Shop towels ~ amzn.to/2FC7UgM
Torque Wrench ~ amzn.to/2I7ke5h
Allen Sockets ~ amzn.to/2GlcnAz
Torx Sockets ~ amzn.to/2pL0SfL
Filmed and edited by the best video dude in the biz, Ray Youman
~~~~ Playlists ~~~~
Humble Mechanic Podcasts ~ youtube.com/playlist?list=PLwfzU5uvU-lKLEvGiyabJxxazND2S7lC-
Project White Wookie ~ youtube.com/playlist?list=PLwfzU5uvU-lJpDFuyOTudNRrlTdTRihqk
Failed VW parts videos ~ youtube.com/playlist?list=PLwfzU5uvU-lIxxNMAO-nNe4c3Liohrrr-
Tool and Product Reviews ~ youtube.com/playlist?list=PLwfzU5uvU-lKA_oaxAkY0KKTvS4cxuPA7
How To videos ~ youtube.com/playlist?list=PLwfzU5uvU-lKM-_ShLfG-IrNqklIp0_To
MK1 VR6 Swap Videos ~ youtube.com/playlist?list=PLwfzU5uvU-lKJ09uR9evf987LmSuijY-p
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disclaimer:
The content of this video is available for informational and educational purposes only. It is not intended to be a substitute for the professional advice of a mechanic who has personally inspected your vehicle, nor does it create a relationship of any kind between the Humble Mechanic and you. Every situation may be different, and the Humble Mechanic does not make any warranties, whether express or implied, as to the accuracy, fitness, or applicability of the information or automotive parts portrayed in this video to any project and makes no guarantee of results. The Humble Mechanic and any sponsors of this video will not be liable for any damages related to personal injury, property damage or loss of any kind that may result from the use or reliance on this video and/or any automotive parts represented in this video. You are using the information and automotive parts portrayed in this video solely at your own risk
Blue smoke from your Porsche, VW, or Audi doesn't always mean the engine is done. One of the most common causes is a failed Air Oil Separator (AOS) or PCV system, and today we're tracking the problem down on my Porsche 996. Then we're going to see if we can replace the AOS without following Porsche's factory repair procedure.
If you've searched for Porsche blue smoke, Porsche AOS failure, Porsche Air Oil Separator replacement, VW PCV problems, Audi PCV failure, crankcase ventilation issues, or excessive crankcase vacuum, this video will walk you through the diagnosis, explain why these systems fail, and show a different approach to the repair.
~~~~ Support the Show ~~~~
Become A CrewMember ~ goo.gl/D7eROI
Patreon ~ patreon.com/user?u=4243029
Shop Amazon ~ amzn.to/2FQErAm
Audio ONLY Podcasts ~ goo.gl/5XcZxB
~~~~ Recommended Tools ~~~~
Impact driver ~ amzn.to/2HsxS2H
Small Impact driver ~ amzn.to/2DZdsMN
Electric ratchet ~ amzn.to/2FydxMS
Magnetic tray ~ amzn.to/2FEpQ6g
Basic hand tools ~ amzn.to/2GnjF7K
Box wrench set ~ amzn.to/2FzoJch
ScrewDriver set ~ amzn.to/2FEjcgd
Shop towels ~ amzn.to/2FC7UgM
Torque Wrench ~ amzn.to/2I7ke5h
Allen Sockets ~ amzn.to/2GlcnAz
Torx Sockets ~ amzn.to/2pL0SfL
Filmed and edited by the best video dude in the biz, Ray Youman
~~~~ Playlists ~~~~
Humble Mechanic Podcasts ~ youtube.com/playlist?list=PLwfzU5uvU-lKLEvGiyabJxxazND2S7lC-
Project White Wookie ~ youtube.com/playlist?list=PLwfzU5uvU-lJpDFuyOTudNRrlTdTRihqk
Failed VW parts videos ~ youtube.com/playlist?list=PLwfzU5uvU-lIxxNMAO-nNe4c3Liohrrr-
Tool and Product Reviews ~ youtube.com/playlist?list=PLwfzU5uvU-lKA_oaxAkY0KKTvS4cxuPA7
How To videos ~ youtube.com/playlist?list=PLwfzU5uvU-lKM-_ShLfG-IrNqklIp0_To
MK1 VR6 Swap Videos ~ youtube.com/playlist?list=PLwfzU5uvU-lKJ09uR9evf987LmSuijY-p
~~~~ Be sure to follow me at ~~~~
humblemechanic.com
INSTAGRAM ~ instagram.com/humblemechanic
FACEBOOK ~ facebook.com/HumbleMechanic
TWITTER ~ twitter.com/HumbleMechanic
Amazon Store ~ amazon.com/shop/humblemechanic
disclaimer:
The content of this video is available for informational and educational purposes only. It is not intended to be a substitute for the professional advice of a mechanic who has personally inspected your vehicle, nor does it create a relationship of any kind between the Humble Mechanic and you. Every situation may be different, and the Humble Mechanic does not make any warranties, whether express or implied, as to the accuracy, fitness, or applicability of the information or automotive parts portrayed in this video to any project and makes no guarantee of results. The Humble Mechanic and any sponsors of this video will not be liable for any damages related to personal injury, property damage or loss of any kind that may result from the use or reliance on this video and/or any automotive parts represented in this video. You are using the information and automotive parts portrayed in this video solely at your own risk
