Hello can someone check how serious is this leak? The car have 75000km.

Looks for me that is is in the bank 1.

 

Weeping from the AOS or the bellows underneath the AOS.

 

Is it serious?
Quick fixable?

 

Can you get a crankcase pressure reading? Tells you if the AOS is toast, then go from there. It’s not an uncommon place for oil migration evidence.

 

Yes it’s serious,no it not quick. Is this the same car you’re thinking of buying? Get a proper ppi performed. It will cost a few hundred bucks and potentially save you 10’s of thousands!

 

yes it is the car that I'm thinking to buy.

according from what someone mention it can be the AOS which is quite common issue

 

the readings in the computer look normal. 1.0 on idle and temperature a little bit above 80ºC.

 

AOS vacuum should be in volume displacement units; ie, 5 inches H2O.

 

I will request a PPI inspection so they can take it in consideration.

 

I’m not saying it’s not “common” it’s a know weak point for these cars. I’m saying it’s not inexpensive or easy. Someone decoded the vin and it’s a tippy cab, correct? I’m saying there’s plenty of well maintained 996’s out there. Some more desirable than others. Prices vary on the initial cost. No matter what initial purchase is, maintenance is the same price. Even diy,,,,parts for these cars are $%$,,,,,
Tiptronic cabs with low mileage and extensive service records will cost far less than a manual coupe with the same documents. But hey it’s your $$ do what makes your life better.

 

It's serious cause the owner can't tell you what it is, which is the sign you should pass. It's also got a pan leak. Not well cared for. Like Patunia said tip cars are a dime a dozen, find one that doesn't have multiple leaks.

 

There, I fixed it for ya.

I think you were mixing up blow-by test to evaluate piston ring seal against cilinder bore (expressed in volume/unit of time or, as showcased on here by Porschetech3 as an equivalent measurement expressed in units of pressure) and AOS test by measuring crankcase vacuum.

 

What reading is shown as 1.0? Lambda? In that case, it says very little, if anything about the state of the AOS.
You should find out if it is working properly or not so that you can negotiate a better price if it is indeed broken. The way to do that is by measuring crank case vacuum using a digital manometer connected to an appropriate oil cap (that you drill a hole into).
A vacuum of 4-6 inches of water column is considered 👍.


Another, different test and very worthwhile is described here: https://rennlist.com/forums/996-foru...w-by-test.html

Oh, and tell the world of rennlist that you're in Portugal, so the US members understand that tiptronic cabriolets might perhaps not be so readily available as they presume.

 

Ha! Thanks!

 

Be aware that an AOS replacement on an MK-I Tiptronic Cabriolet is an engine out procedure. If the car is otherwise suitable to you, have the Ultimate AOS installed and get the the IMSB changed at the same time. Factor that into your negotiations.