The performance petrol in the C7 A6 range, using a 3.0-litre supercharged V6 from the EA837 family. Smooth, powerful, and refined on the motorway, producing 300 hp pre-facelift and 333 hp post-facelift. European models are paired exclusively with quattro and the 7-speed S-tronic DL501 dual-clutch gearbox. The supercharger gives instant throttle response without turbo lag, and the engine can reach well beyond 200,000 km with proper maintenance.
Strong and responsive supercharged V6
Refined motorway cruiser
PCV and coolant repairs need supercharger removal
S-tronic DL501 mechatronics risk
Buy if: You want a fast, refined executive saloon with a proven V6 and can find one with complete service history, preferably post-2013.
Avoid if: You need low running costs or cannot budget for the labor-intensive engine access required when repairs arise behind the supercharger.
Expected Annual Maintenance Costs
Common Problems
Oil separator fails causing excessive oil consumption, rough idle, and vacuum leaks · more· less
The PCV valve (oil separator) is located underneath the supercharger, making replacement labor-intensive. The valve's diaphragm tears or its pressure regulation degrades, leading to excessive crankcase pressure. Symptoms include increased oil consumption (often the first sign), rough idle, misfires, and a check engine light. Pre-mid-2012 engines had a higher-pressure regulation valve that was more prone to failure; Audi released an updated part with lower pressure regulation. Failure typically occurs between 80,000 and 130,000 km. DIY cost is around €200-300 in parts, but professional replacement runs €1,200-1,800 at a dealer because the supercharger must be removed to access it. Independent specialists charge €400-900. Audi issued a warranty extension (code U38) in certain markets covering PCV replacement up to 10 years or 190,000 km.
Plastic thermostat housing cracks and water pump leaks from bearing weep holes · more· less
Early 3.0 TFSI engines (2011-2012) had thermostats prone to sticking closed, causing overheating. Audi addressed this with a customer satisfaction bulletin and updated parts. The water pump can leak from the bearing weep hole, typically between 70,000 and 120,000 km. Post-2013 engines received redesigned components with improved materials. Replacement cost at an independent shop runs €600-900 including parts and labor. Dealer quotes range from €1,000-1,400. Always check coolant level and condition during a pre-purchase inspection; low coolant or signs of overheating are red flags.
Solenoid valves in the mechatronic unit wear out causing jerky shifts or limp mode · more· less
European A6 3.0 TFSI models use the 7-speed S-tronic DL501 wet dual-clutch gearbox. The mechatronic unit's solenoid valves are heavily stressed and can degrade over time, causing jerky gear changes, hesitation, EPC warning light, or gearbox fault messages. This typically appears between 100,000 and 180,000 km. The gearbox requires fluid changes every 60,000 km; neglecting this accelerates wear significantly. Dealer gearbox replacement quotes can reach €6,000-10,000, but specialist mechatronics repair or rebuild is possible for €1,500-2,500. Repair kits are available for €300-500 for competent DIY mechanics. Check for smooth shifts across all gears and listen for clunking during a test drive.
Upper and rear timing chain covers develop oil leaks, especially on higher-mileage engines · more· less
The timing chain covers at the rear of the 3.0 TFSI engine can develop oil leaks as the gaskets age. This is more common on engines with over 120,000 km. The rear timing cover is particularly expensive to repair because access requires significant disassembly, with some shops quoting 15-20 hours of labor. Upper timing cover leaks are somewhat easier to address. At an independent specialist, expect €1,500-2,500 for upper cover repair. Rear cover repair can reach €3,000-4,000 due to the extensive labor involved. If caught early, the leak is cosmetic and can be monitored, but it worsens over time.
Direct injection means no fuel washes intake valves, leading to carbon deposits and rough running · more· less
Like all direct-injection engines, the 3.0 TFSI does not spray fuel over the intake valves, so carbon deposits accumulate over time. Symptoms include cold-start misfires, rough idle, reduced power, and poor fuel economy. The issue typically becomes noticeable between 80,000 and 130,000 km. The cleaning process (walnut blasting) requires removing the intake manifold and supercharger, which is a full day of labor. Cost at a specialist runs €600-900, while dealer pricing can reach €1,200. Using high-quality fuel and regular highway driving helps slow carbon buildup. Some owners perform this service preventively every 80,000-100,000 km.
Hydraulic engine mounts sag or tear, causing vibrations and clunking at idle · more· less
The liquid-filled hydraulic engine mounts on the 3.0 TFSI are known to degrade over time, typically between 80,000 and 130,000 km. Symptoms include noticeable vibrations at idle, a rough feeling when stationary in gear, and clunking noises during acceleration or deceleration. Replacement involves both left and right mounts, as they tend to wear at similar rates. OEM mounts cost €120-200 each, with aftermarket options from €60-100. Labor runs €200-400 at an independent shop. Total replacement cost is €500-700 at an independent or €800-1,000 at a dealer. Upgraded aftermarket mounts from companies like 034 Motorsport may last longer than OEM.
Optional air suspension compressor or struts can fail, typically after 80,000-120,000 km · more· less
Air suspension is an optional extra on the A6 C7. If equipped, the compressor and air struts are known weak points. The compressor can fail from overwork if air struts develop small leaks. Symptoms include the car sitting low on one corner, slow ride height adjustment, or a compressor that runs constantly. Replacement compressor costs €400-600 for parts, with labor adding €300-500. Individual air struts cost €500-800 each. Early C7 models (2011-2013) had a possibly problematic batch of compressors. Cars with standard steel springs avoid this issue entirely. During a test drive, check that all four corners sit level after the car has been parked overnight.
Reliable V6 with labor-intensive repair access
The 3.0 TFSI supercharged V6 is fundamentally a strong engine that can exceed 200,000 km with proper maintenance. However, the supercharger's position over the engine means that several common repairs (PCV valve, carbon cleaning, coolant work) require its removal, significantly increasing labor costs. Pre-2013 engines are more prone to thermostat and PCV issues. The S-tronic DL501 gearbox requires regular fluid changes to avoid expensive mechatronics problems. Post-2013 facelift models with documented service history represent the best value proposition.
Recalls and Technical Service Bulletins
Takata airbag inflator (selected 2011-2014 production, verify by VIN)
Verify completed
PCV valve warranty extension (code U38, 2013-2016 models, 10 years / 190,000 km in some markets)
Check eligibility with dealer
Thermostat customer satisfaction action (early 2011-2012 models, thermostat sticking closed)
Verify completed
Contact an Audi dealer with the VIN to verify all recall and customer satisfaction actions have been completed. The PCV warranty extension is particularly relevant for 2013-2016 models and may still apply depending on the vehicle's age and mileage.
Warranty Status
Factory warranty (2 years, no km limit)
Expired on all used A6 C7 models
Rust perforation warranty (12 years)
May still apply on 2014+ models
PCV warranty extension
10 years / 190,000 km on 2013-2016 models (market-dependent)
All A6 C7 models are outside their original 2-year factory warranty. Check with an Audi dealer whether the PCV valve warranty extension applies to the specific vehicle, as this can save over €1,500 in repair costs. Extended warranty plans may be available through Audi or third-party providers.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.