The Audi A5 with the CCWA engine is emitting blue smoke.

[Hannah_Baker2000]

Recently, I purchased a vehicle with an A5 CCWA engine. I have noticed that when I accelerate forcefully, blue smoke is emitted from the exhaust. However, the smoke is not too severe and transitions into grayish-white smoke after the first blue puff. This grayish-white smoke dissipates while the vehicle is at idle. Currently, I have conducted inspections for smoke testing, coolant loss, and engine oil loss, but I have not found any issues. However, I did notice that the turbo has some little movement in the shaft and the blades show small signs of wear and tear. The next item I will investigate is the PCV system. Do you have any suggestions or hypotheses on what it may be?

[AudiFan2021]

What is the car's year of manufacture, mileage, and service history?

[Hannah_Baker2000]

The vehicle was manufactured in 2009, has travelled 106,000 km, and comes with a complete record of all maintenance and repairs.

[Sarah_Jane1980]

What is the precise definition of that?

Customer: What was the frequency of its servicing?
Seller: Affirmative.

[John_Doe1975]

An very pessimistic observation.
However, it is often very accurate.

[Sarah_Jane1980]

Indeed, the statement "full service history" lacks meaningful information.

For instance, suppose the automobile has had just two oil changes since it was first purchased, and you possess a document including receipts as evidence of those services. Indeed, you own a comprehensive service history, since every maintenance activity performed on the vehicle is meticulously recorded.
Does that imply that the automobile was well maintained? Incorrect

If blue smoke is only present at the first startup in the morning and thereafter improves, it is possible that the valve stem seals are leaking. During the night, oil seeps into the cylinder and then undergoes combustion.

If the vehicle is consistently using oil, there are many potential causes, such as faulty piston rings or a malfunctioning positive crankcase ventilation (PCV) system. However, I have little knowledge on the specific 3.0 V6 TDI engine.

[AudiLover2003]

Which specific model of the A5 are you referring to? Which fuel type do you prefer: petrol or diesel? If you own a B8 2.0 TFSI model, there is a significant likelihood that the issue lies in the Piston Rings, necessitating an engine rebuild.

Blue smoke is the result of the combustion of oil, which may be attributed to one or more of the following factors:
1- Polyvinyl chloride (PVC)
2- Turbo
"3- Pistons".

Hopefully it ranks inside the top two.

[Hannah_Baker2000]

The 3.0 TDI V6 engine does not emit smoke during startup or regular driving. Based on the observation that the vehicle emits smoke while accelerating aggressively, it is reasonable to infer that it may be equipped with a turbocharger. After installing a larger intercooler, I believe the turbocharger had to exert more effort to generate more airflow, maybe causing small damage to the internal seals of the turbo.

[AudiLover2003]

I recommend having the turbo examined, since it is your most advantageous course of action.

[Hannah_Baker2000]

Currently, there are no instances of information leakage. The blades are worn out, and I am experiencing oil leakage, therefore I will install an oil catch to assess the situation. Upon removing the engine oil cap while idling, I saw a little emission of white smoke. However, there was no smoke detected when checking the dipstick. It is reasonable to assume that this is a usual occurrence, since diesel engines tend to produce some smoke from the cap. There was no simultaneous decrease in oil quantity, which is quite peculiar.