Audi Repair: Boost, valve seals, smoking oil

Question
Hello again.

Questions are :  What could be causing the smoke ?  Why do I loose boost temporarely ?

I've already checked for oil in cat, no oil, turbo is new so it's not leaking, cat is emptied, I have no code, and no vaccum leaks.
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The text above is a follow-up to ...

-----Question-----
Hello,  I have an Audi A4 2001, 5 spd quattro 1500 000KM.  The turbo is new 8000km and was running OK.  Since a month, when I push it to hard (over 4000rpm aprrox)I loose all boost for about 15 mins without earing it.  Then it comes back big time till I push it too hard again.  Also my car is smoking oil, but I don't seem to consume a lot since I changed the oil about 5000k ago it is still on level.

It'a quick resume, but I can feel you with more details that you would need to solve my problem.
-----Answer-----
hello
So, what is the question?
Is there any faults in ECM?
Smoke, I will check for oil between turbo and CAT. by pulling O2 sensor if there is any oil check how much is before turbo. That will tell you if turbo has any leaks.
good luck          pltech

Answer
Hi
if it smoking oil it has to come from engine.
It can be only from turbo or leaking valve seals.
Boost--- there is boost solenoid which sometimes gets cloged with oil, and than it will not boost.
It is 3 way valve very close to turbo on the airhose coming out from filter