I complained about excessive oil consumption at my 12,500km service (3.5 litres since the 5,000km oil change), so I was put onto "oil watch".
I took the car back today, after doing 1,800km, and it was down to the L mark on the dipstick. They topped it up, and calculated I am well over the trigger threshold where S.A. will consider replacing the entire "bottom end" of my engine.
I'll hear the decision next week....