Low oil light in between service performed by dealership requiring 1-2 quarts of oil. loses power/acceleration when needed 'stalls'. these where all symptoms leading up to the engine knocking due to timing chain tensioner defect. there is a class action currently on 2.0 audis and they are on their 5th version of the defectiuve tensioner. supposedly corrected the issue with latest version. clearly thats not the case. spoke with dealer service manager and audi owne care and got the run around. planning on opting out if need and file seperatly for 3.0 owners.