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PGD
Silverstone


Joined: 18 Jul 2018
Posts: 103



PostPosted: Sun Jan 26, 2020 7:16 pm    Post subject: AOS - is it time to replace it? Reply with quote

Hey folks.

Before I splash the cash I just wanted to check I was going down the right lines:

I’ve got a smear of oil inside the throttle body. Enough to pool into a few drops with the TB removed

After a very short journey ie pulling the car out of the garage. I’ll get a puff of blue smoke on restarting the engine.

Is this a pretty sure sign the AOS needs replacing?

Thanks in advance for any help 👍
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7829
Location: Brighton


PostPosted: Sun Jan 26, 2020 7:37 pm    Post subject: Reply with quote

Basically .. No .

997 is not a 996 .. on both models you will get a certain amount of oil in the manifold .

Excessive amounts are difficult to say .. if you had pools of oil in the manifold and smoking on start up then ( more than 10 seconds ) i would lean towards yes but the symptoms of a 997 failure on these is usually different from a 996 ..

A whistling noise or indeed a shreek is more common ... these suffer from vacuum failure .. ie a collapse that causes a vacuum and a noise .

Basically a smear of oil is totally normal .

If it ain't broke ... then just monitor it .
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resigner
Suzuka


Joined: 19 Dec 2013
Posts: 1247



PostPosted: Sun Jan 26, 2020 7:37 pm    Post subject: Reply with quote

Whats the oil consumption like? Mine went from 1200 miles a litre, to 1000, to 700, to 300 and smoke all over the place on start up......

Of course, when you get to that stage, oil gets into all sorts of places in the system and it took a few months and a few thousand miles to stop burning oil out the back from where it had got to.
 
  
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PGD
Silverstone


Joined: 18 Jul 2018
Posts: 103



PostPosted: Sun Jan 26, 2020 9:13 pm    Post subject: Reply with quote

Ok fair enough, I’ll leave it then 👍

Oil consumption is about 1/2 a litre to 1000 miles.
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resigner
Suzuka


Joined: 19 Dec 2013
Posts: 1247



PostPosted: Wed Jan 29, 2020 7:37 pm    Post subject: Reply with quote

PGD wrote:
Ok fair enough, I’ll leave it then 👍

Oil consumption is about 1/2 a litre to 1000 miles.


Porsche say 600 miles to a litre is perfectly fine.... What oil are you using? Whats the mileage?
 
  
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PGD
Silverstone


Joined: 18 Jul 2018
Posts: 103



PostPosted: Wed Jan 29, 2020 9:38 pm    Post subject: Reply with quote

Mobil 1 and 91k miles
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