The 2008-2017 Audi S5 with the 3.0T supercharged V6 is a strong performer when maintained, but suffers from catastrophic carbon buildup issues and a handful of expensive mechanical vulnerabilities that can turn an enthusiast's dream into a financial nightmare if neglected.
Intake Valve Carbon Buildup Leading to Engine Failure
Common · high severity
Typical onset: 60,000-100,000 mi
Symptoms: Rough idle and misfires that progressively worsen, Loss of power and hesitation under acceleration, Check engine light with multiple misfire codes, In severe cases: bent valves, damaged pistons, catastrophic engine failure requiring rebuild
Fix: Direct injection means no fuel washing over intake valves. Carbon accumulates until valves can't seal or close fully, causing misfires that can grenade pistons and bend valves. Preventive walnut blasting takes 4-6 hours. Full engine rebuilds with new pistons, rings, and head work run 40-60 hours when carbon-induced detonation destroys internals.
Estimated cost: $800-1,200 for walnut blasting preventively; $12,000-18,000 for full engine rebuild after failure
Timing Chain Tensioner and Guide Failure
Occasional · high severity
Typical onset: 80,000-120,000 mi
Symptoms: Rattling noise on cold start that disappears after 5-10 seconds, Metallic grinding or whirring from front of engine, Check engine light with cam/crank correlation codes, Sudden no-start condition if chain jumps timing
Fix: The upper timing chain tensioner and guides wear, allowing slack that can jump timing and cause valve-to-piston contact. Engine-out job on some variants due to transverse mount. Requires new chains, tensioners, guides, and often cam adjusters. 18-24 hours labor, must include updated revised parts.
Estimated cost: $4,500-7,000
Supercharger Clutch Bearing Failure
Occasional · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: High-pitched whine or squeal under acceleration, Grinding noise from front of engine bay, Loss of boost and significant power reduction, Supercharger oil leaking from front seal
Fix: The electromagnetic clutch bearing on the supercharger input shaft wears out, causing noise and eventual disengagement. Requires supercharger removal and rebuild or replacement. 8-12 hours labor. Many shops replace the entire supercharger unit rather than rebuilding due to reliability concerns with used internal components.
Estimated cost: $2,500-4,500 for rebuild; $5,000-7,000 for new/reman unit
Transmission Oil Cooler Line and Mount Failure
Common · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: Transmission fluid leaking under vehicle, Rough or delayed shifting when cold, Transmission overheating warnings on long drives, Clunking from underneath on acceleration/deceleration
Fix: The transmission cooler lines corrode and leak where they connect to the cooler, and the transmission mount fails causing excessive movement and accelerated wear. Lines require dropping subframe for access. Mount replacement is straightforward but often done simultaneously. 6-8 hours for both.
Estimated cost: $1,200-2,000
Water Pump and Thermostat Housing Leaks
Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Coolant smell in cabin or under hood, Coolant puddles under vehicle on passenger side, Low coolant warning light, Overheating if leak becomes severe
Fix: Plastic thermostat housing and water pump develop leaks from age and heat cycling. Water pump is mechanical, driven by accessory belt. Housing and pump often replaced together preventively. 4-6 hours labor. Always replace coolant temp sensor and gaskets during this job.
Estimated cost: $1,000-1,800
PCV System and Valve Cover Breather Failure
Common · low severity
Typical onset: 40,000-80,000 mi
Symptoms: Oil consumption increasing (more than 1 qt per 1,000 mi), Whistling or hissing noise from engine bay, Rough idle and occasional misfires, Oil residue around intake and supercharger area
Fix: The PCV valve integrated into the valve covers fails, causing excessive crankcase pressure that pushes oil into the intake system and contributes to carbon buildup. Requires valve cover replacement (can't service separately). 3-4 hours per side. Do both sides if one fails.
Estimated cost: $800-1,400
Owner tips
Walnut blast intake valves every 40,000-50,000 miles religiously — this single preventive measure can save you from a $15K engine rebuild
Use only high-quality full synthetic oil (Audi 502.00 spec minimum) and change every 5,000 miles maximum, not the 10K interval — these engines are intolerant of extended intervals
Replace transmission fluid and filter every 40,000 miles despite 'lifetime fill' claims — S-tronic/DSG units are sensitive to degraded fluid
Listen for timing chain rattle on cold starts after 60K miles — catching tensioner wear early prevents catastrophic failure
Budget $2,000-3,000 annually for maintenance and repairs after 80,000 miles if you want to keep it reliable
Buy only with comprehensive service records showing carbon cleaning and proactive PCV/coolant system maintenance, and budget for inevitable supercharger and timing chain work — otherwise, you're gambling on a very expensive engine rebuild.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: Battery located in trunk under floor; Group 49 H8 size; AGM required for proper voltage management
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Every control module on the 2008-2016 Audi S5 — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
📍 Rear trunk lid, integrated in trunk handle or license plate area
🔧 VCDS or Autel
⚠️ Optional equipment. Calibration for parking guidelines may be needed.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain model year 2011-2012 Audi S4, S5, Q7, 2012 Audi A6, Volkswagen Touareg Hybrid, and 2012-2013 Audi A7 vehicles. In the affected vehicles the fuel injection system may experience a fuel leak.
Consequence: A fuel leak in the injection system in the presence of an ignition source, increases the risk of a fire.
Remedy: Volkswagen will notify owners, and dealers will replace the fuel rails and corresponding seals, free of charge. The recall began on March 17, 2015. Owners may contact Audi customer service at 1-800-822-2834 or Volkswagen customer service at 1-800-893-5298. Volkswagen's numbers for this recall are 24AP for Audi customers and 24BK for Volkswagen customers.
Performance
Horsepower
333hp
Torque
325lb-ft
0–60 mph
4.9sec
Quarter mile
13.4sec
Top speed
155mph
Fuel economy (EPA)
City
18mpg
Highway
26mpg
Combined
21mpg
Fuel
Premium Gasoline
Capability & size
Curb weight
3,968lb
EPA class
Subcompact Cars
Wiper blades
B9 generation introduced late 2016 as 2018 MY, 2017 MY is final B8.5 coupe, no rear wiper
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2008–2017 Audi S5 3.0L Supercharged V6 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.