Audi A6
Naturally aspirated V6 with petrol direct injection. Smooth running and linear throttle response, but prone to intake valve carbon build-up due to direct injection.
Worry engine — costly weakness looms
204 hp 2.8L with a known issue: timing chain stretch (clutch side). The risk of expensive repairs overshadows any driving pleasure.
Engine Weaknesses 5
The 2.8 FSI has three timing chains installed on the gearbox side. Replacement requires full engine removal, making the repair particularly expensive. Rattling on cold start appears from around 150,000 km.
Symptoms: Metallic rattling on cold start that settles after warm-up; with severe stretch also rattling under load
Like all FSI engines without port injection, oil carbon deposits build up on the intake valves. Fuel additives do not help — only mechanical cleaning (walnut blasting) reliably removes the deposits.
Symptoms: Power loss, rough cold running, increased fuel consumption, occasional misfires on cold start
Individual examples show significantly elevated oil consumption of over 1 liter per 1,000 km. The cause is worn piston rings or cylinder walls. Audi replaced complete engines in some warranty cases.
Symptoms: Blue exhaust clouds when accelerating, oil level drops noticeably between services, engine oil smell after driving
The FSI system mechanical high-pressure pump can wear at higher mileages and cause pressure loss in the injection system. Symptoms often develop gradually and are initially misdiagnosed as EGR or ignition problems.
Symptoms: Poor cold-start behaviour, power dips under load, fault code P0087 (fuel pressure fault) in memory
On the 2.8 FSI, worn hydraulic lifters can produce a rattling that is easily confused with timing chain problems. Regular oil changes with quality oil slow the wear.
Symptoms: Ticking noise from the cylinder head, especially on cold start; noise disappears after warm-up or remains constant
Vehicle Weaknesses 9
On model years 2015–2018, the locking bolt of the tow bar can fracture, potentially causing the trailer to become detached while driving. Free workshop visit required.
The Multitronic CVT gearbox has a notoriously poor reliability record. Improved on the C7, it remains a risk. Total failure possible from 100,000 km; repair is very costly.
A material defect can cause the camshafts in the 3.0 TDI to fracture, leading to engine damage. Mainly affects vehicles from model year 2014 to early 2017.
The optional air suspension (AAS) is prone to failure through porous air bellows and defective compressors. Repair costs of 600–1,800 EUR per corner are possible.
LED headlights fail due to defective control modules or individual LEDs. Repair is often more expensive than replacement, as modules cannot be replaced individually.
The automatic climate control shows malfunctions from around 60,000 km: incorrect temperature regulation, blower stage issues or complete failure of individual zones on the three-zone system.
Wheel bearings, particularly at the rear axle, show increased wear at higher mileages. Regularly flagged on vehicles from 80,000 km.
On the C7, rust occurs primarily on the underbody and sills, sometimes in hard-to-reach areas. On vehicles over 7 years old, the underbody should be thoroughly inspected.
On V6 and V8 engines, engine mounts often wear from around 50,000 km, causing noticeable vibrations.