My A2 is losing about 0.5 Litres for every 500 miles. The oil loss appears to be near the engine block. I think it is from the breather pipe attached to the PCV Valve.
If you were losing that much via an external leak the engine would literally be dripping in oil so its more likely the engine is burning most of it. The breather is built into the valve cover and not replaceable as a separate unit. You could however remove the pipe which runs from the cover to the intake pipe connection near the turbo and check for any blockage.
This is the response I provided last time you asked the same question - http://www.a2oc.net/forum/showthread.php?t=13335&highlight=oil+consumption
I did read you last response but still an issue with my car. Not sure what else I can do before taking it to a garage. I have taken out the pipe and checked for blockage but it is clear.
Are you suffering from power loss? I only ask as we started to lose a reasonable amount of oil when the intercooler split. Engine bay was covered in the stuff especially between engine and inner wing on the drivers side.