Why does it burn oil so quickly. I have to top oil off every week.

Any external leaks? Smoke from exhaust? 2011 was a bad year for these engines. Dealers know of it. Also how many miles? What has your dealer said?

Not sure this applies but I had a similar issue with my XC70 and it turned out to be a clogged PCV valve/oil trap assembly. Thank you Al Gore for that lovely emissions oil trap addition to our engines... From the Internet: A common source of oil leaks and performance issues Volvo oil traps are a key component to the breather system of the engine. With high mileage this oil trap can clog or the diaphragm inside the trap can fail causing a variety of performance issues. When replacing the oil trap it is important to also inspect the hoses and replace them as needed. We highly recommend inspecting all the hoses in order to ensure proper performance and service life. What causes my breather system to fail? Wrong oil grade, quality and/or viscosity Vehicles driven too many miles between oil changes Vehicles frequently driven short distances with many cold starts Excessive idling Fuels of low quality or with high alcohol content Additives added to oil or fuel High ambient temperature High air humidity What are some of the symptom's I can expect if my breather system is clogged? Illuminated oil pressure lamp. – Due to clogged oil suction strainer to oil pump or oil filter Illuminated Check Engine Lamp- Due to incorrect engine fuel trim level parameters Noise (whistling) – Noise due to high pressure in crankcase. This noise will stop if the oil filler cap is removed. Poor Drivability- Clogged crankcase ventilation can reduce the engine performance Uneven / Oscillating Idling- Caused by clogged crankcase ventilation Oil leak- From engine seals due to restricted crankcase ventilation Noise (knocking)- Low oil pressure can cause premature bearing wear and lead to internal engine component failure HIGH OIL CONSUMPTION/noise from Turbo A damaged bearing or seal in the turbo due to lack of oil as a result of oil consumption. What can I do to check for it? The first step is to inspect the oil filter to see if it is abnormally dirty. An abnormally dirty filter is easily recognized by its thick, black deposits If the engine has a problem with carbon deposits, the passageways in the engine block and oil trap may be completely or partially clogged. Remove and check the oil trap, hoses and their passageways in the engine block. There should not be any major collections of carbon deposits in the hoses or in the passageways in the block. Drain the engine oil. Remove the oil pan and check the oil pan and crankcase for deposits. Normally, there should not be any deposits. Also check the oil suction strainer on the oil suction line for contaminants and deposits. Use a low caliber Vacuum gauge to check for positive pressure through the dipstick tube

I have a 2010 XC60 that was losing oil. I never saw any leaky spots on my driveway, but the check oil light would come on. The dealer told me Volvo made a (poor) design change and reduced the number of piston rings. The oil was leaking into the engine.They replaced the pistons in late 2013 but that did not solve the problem. Early 2014 Volvo sent over a new engine and that did the trick. Check with your dealer - quickly - before your Safe and Secure runs out!