Audi=No fault code, no idea
If you got through 4 litres before the oil light came on you have a problem there that needs to be fixed ..oil light should come on if you are 1ltr down never mind 4 !!
to be honest i would be going into battle about this. I would not want a car thats been running 4 ltr's short of oil. if its getting past the rings it would be smoking like a beagle after coasting down a hill for example. I would go so far as to say if the compression is down on all four pots after 14k miles then that sort of wear will be right through the engine not just on the rings/bores if its as a result of oil starvation . If its just down on one pot then it could just be an oil control ring but its unlikely with that sort of oil consumption.
Sorry but i would be looking for a replacement car or at least an engine. Its difficult to see how you could possibly get that sort of wear on just the rings and bores. In my experience a re bore and rings ( dont let them just change the rings !!) will probably show up bearing failure that is not obvious in a engine running a low comp.
Last edited by paddy; 18th March 2011 at 18:42.