Audi A4 with fog, a little snow and an oily ASV

[Jb boin]

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Made a video of the A3 yesterday like i did of the A4 two days ago... but it did save it in portrait mode... WTF :

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I noticed that the A4 had oil on my Anti Shudder Valve (kind of a throttle body for diesel with a different use than a throttle body) which has been out and cleaned this summer (and less than 1000km ago) :

When i first cleaner it, i assumed that someone had spilled oil on it when filling the engine oil but the was no fill-up since i cleaned it and nothing around that could leak oil on it... guess what, it seems to be a common failure, the oil is passing through the seal at the side of the butterfly to the part with the motor and electronics...

To give you an idea, the valve from up top looks like that (not the exact same part but similar) :

And from the bottom (this time the same part) :

The part mated to it, on it's top with VW and Audi logos is just an aluminium elbow that connects to the intake manifold (no danger there) and at the bottom it's a silicon hose to the second intercooler.

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So... it must be blowing quite a lot of oil on the intake but i was actually surprised that the intercoolers were not that dirty when i cleaned them this summer, here is how dirty the ASV was in comparison :

[jminer]

@jb-boin The view is beautiful, and I love the wagon. Partial to German Diesel wagons as I have one too!

Definitely have a leak there, that looks like decades of grime there instead of a few months.

[Jb boin]

@jminer the photos at the end are from when i cleaned the intercooler and did many other things so it's before i did clean the ASV.

ps: the view is from the village i grew up and where my mother still lives, took a small detour to go upper to make photos as there was almost no snow left at her house but unfortunately there was too much fog to be seeing much and it was starting to get late.

The city on the background of some of the photos is Grenoble, where i live now.

[gmporschenut also a fan of hondas]

@jb-boin Bueatiful location.
Is it possible with the cold weather the Oring shrank causing the leak or is in internal to the valve

[Jb boin]

@gmporschenut-also-a-fan-of-hondas yes it could, it's probably original (15 years old and more than 330000km) but that still makes a lot of oil.

It's probably happening because it's in aluminium and before a bend and with the engine heating/cooling next to it, it must be condensing at some point and the PCV valve could be in bad shape, sending oily fumes on the intake.