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Yep, a TFSI. Major pain. Your usage is well within tolerance even if it seems high.
I had to have a service through Audi before starting the test. They charged $164 for 4.5 litres of oil. I used a litre within 1000 Kay's. Following the procedure is painful but not as bad a forking out 12k for an engine rebuild.
Tell your mate with the A6 to start getting his service records in order and prepare for a fight or just sell the car on.
TFSI? I have been monitoring my oil consumption and I am using 1l every 2,500kms. 1l every 1000 is a PITA. My mate has the same issue in his A6
(For ref, like. No boasting...)