Audi S6
High-revving naturally aspirated engine with direct injection, 5.2-litre V10 with up to 419 kW. Intake valve carbon build-up from FSI typical; early examples known for piston rocking (fixed with facelift). Avoid Longlife intervals — fixed oil changes every 10,000 km recommended. Repairs almost always require engine removal.
V10 in a midsize sedan — acoustically insane, financially risky
Lamborghini V10 in an A6 body: sound from another planet, running costs to match. Above 5,000 rpm the S6 C6 sounds like an exotic sports car — the repair bills fit right in. For enthusiasts who rank sound above reason.
Engine Weaknesses 11
The V10 5.2 FSI has four timing chains each with its own tensioner. Pressure loss in the 'Drive C' chain tensioner causes rattling on cold start. Longlife oil change intervals significantly accelerate chain wear.
Symptoms: Metallic rattling on cold start from the engine bay, disappears after 10–20 seconds; with neglect, permanent chain noise
The R-Tronic automated manual gearbox is considered the Achilles heel of the Gen1 R8. The bladder-type hydraulic accumulator loses its gas pre-charge; system pressure collapses. Typical: shift problems, crawl gears, warning lights. Clutch plate costs approx. 1,862 € gross; removal/installation 16–20 hours labour.
Symptoms: Jerky or refused gear changes, clutch slipping or not engaging cleanly, P0944 hydraulic pressure loss fault code, gearbox oil warning light
Thermal fatigue of the plastic weld seam causes cracking. Leaking coolant over the exhaust manifold can cause an engine bay fire. Recall affects all Gen1 R8 2007–2015. Original part number: 420-121-403.
Symptoms: Rear window mists up with coolant loss, coolant level drops without visible external leak; in the worst case smoke or fire in the engine bay
NHTSA recall affects all Gen1 R8 (2007–2015). Fix: retaining band (420-121-263) around the tank weld seam. Does not solve the underlying problem permanently — a bypass hose to reduce coolant temperature is recommended.
Symptoms: No driver-noticeable symptom until coolant loss; rear window mists up; fire risk in the engine bay on failure
Direct injection without port supply causes heavy coke deposits on the intake valves. Power loss of 30–60 hp documented (measurements rs-klinik.de: 390→444 hp after cleaning). Gen2 CSPB/CMSA has Dual Injection; the problem does not apply there.
Symptoms: Noticeable power reduction from around 50,000 km, rough idle, increased fuel consumption, difficult cold-start
Particularly the S6 C6 and S8 D3 show elevated oil consumption at higher mileage from worn valve stem seals. In the R8 with its dry sump system more critical to monitor; consumption over 300 ml/1,000 km is considered a defect.
Symptoms: Blue smoke on cold start, rising oil consumption above 0.5 L/1,000 km, oil smell after switch-off; warning light illuminates if neglected
FSI high-pressure pumps can develop leaks; fuel vapour enters the engine bay. Injectors (OEM no. 07L906036G / 07L906036K) can become leaky at high mileage and contaminate the engine oil. 10 injectors total, 200–300 € each.
Symptoms: Fuel smell in the engine bay, rough idle, increased consumption, rough running especially on cold start, engine warning light P0300 misfire
The R8-specific dry sump system with a separate oil tank combines the coolant pump and a multi-stage oil pump in one module. Seals and O-rings of this assembly can develop leaks. Access almost always requires engine removal — extremely high labour share.
Symptoms: Oil spots under the vehicle rear-centre, falling oil level without a visible external leak, oil smell after driving
10 ignition coils (OEM: ELDOR) and 10 spark plugs (NGK PFR7S8EG / 06H905601A) represent considerable maintenance effort. Recommended every 30,000 km. V10 Spyder particularly difficult to access. Parts + labour cost: 500–900 €.
Symptoms: Misfires (P030x fault codes), rough idle, engine vibrations, increased consumption; a single failed coil causes noticeable power loss with 10 cylinders
The V10 has up to 6 lambda sensors depending on configuration (pre- and post-cat, both banks). Failures are more frequent than on smaller engines as exhaust temperatures and sensor count are higher. Single sensor 80–250 €; installation on the V10 more expensive due to tight access.
Symptoms: MIL light (engine warning light), increased fuel consumption, P0130/P0136/P0150/P0156 fault codes, slight power reduction; extended failure can cause catalytic converter damage
Recall for Gen1 R8 affects engine management software. Vehicles may not meet all emissions requirements. Emissions test-relevant inspection software changed — vehicles without the update may fail the emissions test.
Symptoms: No driver-noticeable symptom; ECU shows outdated software version; vehicle may fail emissions test
Vehicle Weaknesses 5
Vehicles with the optional air suspension (AAS) frequently suffer compressor failures that can cause the car to sink completely. Typical from 100,000 km.
The vehicle weight of up to two tonnes leads to increased wear across the entire wheel suspension. Control arms are typically the first components that need replacing.
The combination of 435 hp and two tonnes of vehicle weight results in high brake disc wear. Brake discs on the S6 C6 are often worn after 40,000–60,000 km.
The LED daytime running lights on the S6 C6 fail with increasing mileage. Earlier pre-production models are particularly affected. Tail light moisture ingress and rear light problems are additional issues.
Rust occasionally appears on sills, door edges and the tailgate. Less severe than on older generations, but present on cars with inadequate care.