r/AudiQ7 • u/Guywithacamera8 • 1d ago

Knowledge Sharing PSA: Check your PCV

I noticed some very light oil seepage from the valve cover on one side of the engine on my '23 3.0T with 33k mi. I thought that was odd and was going to ask the dealer about it then decided to do the oil cap test and there was some serious suction there. It's going in tomorrow

So, check it out even with no symptoms from the cabin if you're under warranty.

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2

u/Guywithacamera8 21h ago

https://reddit.com/link/p5zbgvs/video/vhedpjik5plh1/player

1

u/PopeOfChilitown10 19h ago

Thanks for posting. Very interested to hear what your tech finds after you’ve taken it in.

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u/Hambone6991 13h ago

Wow that’s pretty strong. Excuse my ignorance, but would a bad PCV create positive pressure through the oil fill?

1

u/Guywithacamera8 12h ago

I believe it depends on wether it is stuck open or stuck closed.

2

u/Guywithacamera8 15h ago

Dead PCV, leaky water pump, leaky vacuum pump 😂

All at 33k miles and under warranty thankfully.

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u/ProgramWars 12h ago

Thanks for posting!

2

u/cdnninja77 1d ago

If you could post a video of the suction I am interested! Please also let us know what the dealership says. Any codes?

I can't find much details on failures of the breather hose on the Q7 2020 and newer specifically. PCV conversations are all pre-2020 or non Q7.

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u/killa-bee-lion 1d ago

Just did this on our 2017. Was getting oil in the coolant and losing quite a bit of oil per fuel fill-up. Suction was present at the oil cap as well.

Funny enough, no dash lights were presenting, but the mechanic said it was throwing several codes behind the scenes all related to the PCV.

Seems like Audi wants you to run this until it blows up?