Audi S6
3.0-litre TDI V6 with 257 hp in the mild hybrid variant (C8). Robust diesel from the EA897 Evo series with 48-volt belt starter generator. Watch for camshaft material defect on early batches; check injector sealing regularly as fuel entry into the oil is a known issue.
V6 replaces V8 — quick, efficient, nobody asked for it
They killed the V8 and replaced it with a V6 and a 48V system. Quick? Yes. Efficient? Yes. Nobody asked for this. The C7 with its twin-turbo V8 is climbing in value while C8s sit at dealers. Three of four C8 buyers on Audizine traded for an S8 — the only way left to get a V8 in the S-range.
Engine Weaknesses 6
Like all EA897 variants, the DTPA has four timing chains that wear prematurely with poor maintenance. Timing chain repair costs several thousand euros.
Symptoms: Rattling and clattering on cold start, timing chain warning in instrument cluster
EA897 EVO 257-hp variants are also affected by camshaft material defects. Audi replaces as goodwill with full service history, but recurrence after replacement has been documented.
Symptoms: Tapping, knocking engine noises of unusual intensity, power drop
Four timing chains in the EA897 (facelift version 2016+): one per cylinder bank, one connecting chain, one for the oil pump. Full replacement takes 15–20 hours, costs approx. €3,000.
Symptoms: Rattling on cold start, engine warning light (camshaft sensor fault)
At high mileage, injectors can become coked, causing rough running and increased consumption. Cleaning or replacement required sooner with predominantly short trips.
Symptoms: Rough running, power drop, increased fuel consumption, soot clouds from exhaust
The 3.0 TDI V6 turbocharger wears with inadequate lubrication or high stress. Typical symptoms are power loss and blue smoke from the exhaust.
Symptoms: Power loss, whistling from turbo, blue smoke from exhaust, increased oil consumption
Early A6 C8 50 TDI units showed a glaring hesitation on pull-away caused by a faulty engine management software. Audi corrected the problem free of charge via software update.
Symptoms: Hesitant response on pull-away, inharmonious surge from standstill
Vehicle Weaknesses 5
Contamination of the bonding surface during manufacture can cause the rear panoramic roof module to detach. Affects A6 models produced in 2018.
Stress corrosion cracking can cause excessive play between the control arm and wheel carrier on the A6 C8 (MY 2019–2021), impairing driving stability. Recall by KBA (action 42L1), free repair at dealer.
High-voltage battery cell modules on A6, A7, Q5 PHEV models can overheat during charging (KBA 15722R / code 93AD). 53,449 vehicles worldwide, 17,012 in Germany affected (production period 08/2019–08/2024). Software update takes approx. 60 minutes.
The MMI infotainment system stands out for frozen displays, unexpected reboots and Apple CarPlay/Android Auto failures. Software updates only partially resolve the problem.
On some A6 C8s, water enters through a leaking wheel arch liner, causing musty smells and moisture in the footwell or boot.