I serviced my Toyota Camry three weeks ago and put 4 litres of mobile oil in. It's three weeks now and I am short of oil again, and this has been the case for the last 4 months. I bought 8 litres of oil.
I cant make a great diagnosis without a little more information, is there a puddle of oil below your car at any time? I cant add comments to clarify issues with you but i will do the best i can with this information.
In my experience this is a good indicator its time for a compression test. Theres only 3 things that make that much oil dissapear;
- Big external leak
- Worn out piston rings
- Blown headgasket
A short term remedy would be to use thicker oil. I know that engine fsm allows for 10w-30, dealerships will use 15w-40 in these too if your in a warm climate this will at least slow down the oil consumption.