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Hi Richard you are on top form with this one, well done its info I have looked at before but after a twelve hour shift had no motivation to go back to, 10/10. Steve.

I can only rely in Google - wiki gives a full list here https://en.wikipedia.org/wiki/Audi_A3 2nd gen near the bottom. If you have 1.8 tfsi then it looks like CDAA

Have a look on this thread https://www.audiownersclub.com/forums/topic/18813-buying-a-mark-2-facelift-tt-18-tfsi-and-oil-consumption/?tab=comments#comment-67154 The issue and affected engine designations are covered and Steve explains the issue /reasoning.

Hi I don't know what designation your engine is but the one thing I do know is between 2009 and 2012 they had a problem with what was loosely termed low friction petrol engines they had used thinner piston rings and slightly larger bores to defeat friction within the engines and cut emissions, this worked until the engines had more milage on them and the burning of oil caused the rings to stick in and burn even more oil, the only reason that I know of this is my friends wife had an 09 cabriolet which was getting through a litre of oil every week, they had such a problem in the USA with this suffering multiple law suits the government got involved and Audi had to admit to the problem and retrofit different blocks to the offending engines at their expense to rectify the problem, this started an avalanche of litigation in Europe which is how my friends wife got her engine fixed after several monitoring sessions with Audi who kept telling her the oil consumption was normal and her threatening legal action they finally rebuilt the engine, this problem is extensively catalogued on the internet with loads of info on which engines were affected, if you look on the archives of this site its probably received more than a mention. Steve.