UPDATE: The car entered service but the mechanic said that it might lose oil since its 0W30 and he suggests 5W30 for the next change. Now he will inspect it, this week, about leaks and the turbo also and he will let me know whats going on.

UPDATE 2: Got it for one week driving, drove around 400-500km urban/extra-urban and it appears it has lost around 200ml of oil - can it be the 0W30 or I might search for another problem? Car is fine, no leaks no nothing - all good.

Also I have noticed it lost very small amount of anti-freeze from the reservoir but it got water pump changed - can it be this?

Ideally - as the 1.8T engine is an older engine model, it is worth running it on the older VAG 504/507 spec oil which should be 5W30.  Its not going to make a ton of difference, but as you will find, VAG cars are SUPER picky about their oil.  Don't cheap out here.

If you google "VAG 1.8T high oil consuption" - there are lots of posting about failing ventilation springs on the PCV (both on here and on VW groups).  Might be a reasonable look.  With oil consumption that high, you really need to get it looked at ASAP.

 

re: coolant.  I would expect the mechanic to top up the header tank after a waterpump change.  Sounds like the system might have 'burped' itself and you now have low coolant.  You need some G12Evo fluid (available online/VAG outfits) to top up the header tank.  I personally keep it on the full-mark.