Audi A6
Supercharged V6 with 220 kW. Mechanically identical to CGWB in a slightly detuned variant. Very refined drivetrain with ample power reserves.
Supercharger entry-level with real character
The CEUC with 300 hp in the A6 C7 hits the sweet spot: enough power for effortless overtaking while more economical than the 333 hp version. The supercharger sounds refined and gives the A6 the necessary temperament.
Engine Weaknesses 7
The integrated intercooler in the Eaton supercharger can leak coolant into the intake path — risk of catastrophic engine damage through hydraulic lock.
Symptoms: Unexplained coolant loss, misfires, white exhaust smoke, power loss.
EA837-typical weakness: chain tensioners lose oil pressure at rest. On cold start the upper timing chain rattles briefly. Neglect risks damage to chain guides.
Symptoms: Brief metallic rattle 1–2 seconds after cold start, disappears completely afterwards.
Coolant pump shows leaks or mechanical failure at high mileages. The A6 C7 3.0 TFSI places high thermal demands on the cooling system.
Symptoms: Coolant loss, overheating warning, temperature gauge fluctuating.
Premature wear of the front Eaton supercharger bearing at high mileages. Whistling noises are the typical warning sign.
Symptoms: Speed-proportional whistling or whining from the supercharger area.
The Eaton supercharger drive belt must be replaced every 60,000 km (not 90,000 km). Belt failure causes immediate boost loss.
Symptoms: Squealing, power loss, sudden power drop on failure.
Direct injection-typical oil carbon deposits on intake valves from crankcase oil mist. Regular walnut blasting required.
Symptoms: Hesitation, power loss, poor cold-start behaviour, rough idle.
Failed membrane in the oil separator leads to uncontrolled oil mist ingestion into the intake, elevated oil consumption and misfires.
Symptoms: Whistling noise on load change, rough idle, elevated oil consumption, false air fault codes.
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.