Early models (2007–2010) and some 2017 versions are notorious for burning oil—sometimes a quart every 1,000 miles—due to failing PCV valves or clogged piston rings.
Water pump and thermostat leaks are frequent failure points that can lead to catastrophic overheating. Check the "V" area of the engine for pooled coolant, which might look like a water pump leak but could be a failing EGR cooler valve. what to look for when buying a used audi q7
Always listen for a metallic rattle during a cold start . This indicates worn tensioners, a repair that can cost thousands and often requires engine removal. High-Cost Components to Inspect Early models (2007–2010) and some 2017 versions are