Audi A8

The early EA897 3.0 TDI (pre-2010) has four timing chains — one per camshaft, one connecting chain, and one for the oil pump. Chain wear from 150,000 km is known; repair requires 15–20 labour hours.

Symptoms: Metallic rattling at cold start that subsides after 1–3 seconds; with severe stretch also rattling under load

On the 2.5 TFSI (CASB), the piston ring land fractures under high combustion pressure. Early units built before June/July 2012 are particularly affected. Engine rebuild from approx. €7,900.

Symptoms: Increasing oil consumption as an early warning sign, then rough idle, compression loss, engine warning light

On the CASB 2.5 TFSI 5-cylinder (RS3 8P), an intake swirl flap screw works loose and falls into the cylinder. Compression failure and total engine damage are the consequence.

Symptoms: Sudden engine warning light, severe juddering/misfires, zero compression in the affected cylinder

The 3.0 TDI EA897 tends to heavy coking in the intake system at higher mileages, especially after the 23x6 software update. Deposits can block the intake channel by up to 80%.

Symptoms: Juddering and misfires at low rpm, rough cold-running behaviour, elevated fuel consumption, near-zero airflow in severe cases

The DPF on the 3.0 TDI cannot regenerate sufficiently with heavy short-trip use and becomes blocked. In an SUV like the Q5, short city runs are particularly problematic.

Symptoms: DPF warning light, noticeable power loss, elevated oil level (fuel dilution from aborted regeneration)

The injectors on the 3.0 TDI can develop leaking seals at higher mileages. Timely renewal of O-ring and copper sealing ring prevents secondary damage. Replacing all injector seals at once is recommended.

Symptoms: Oil residue around the injectors, faint oil smell under the bonnet, occasional misfires

The adaptive air suspension on the A8 D4 is a well-known money pit. Air bellows become porous, the compressor runs non-stop and overheats. Repairing all four corners costs several thousand euros.

The 4.2 TDI V8 in the A8 D4 has a timing chain that is prone to premature wear when neglected. A break causes severe engine damage. Replacement requires complete engine removal.

The 4.2 FSI V8 has four timing chains with phenolic resin guide rails that become brittle with age. Neglected oil changes risk chain skip.

Turbocharger bearings can wear and bring the turbine wheel into contact with the housing. Audi recalled around 26,000 vehicles in 2022.

Leaking air bellows cause the vehicle to sink and force the compressor into continuous operation until it fails. Front and rear are equally likely to be affected.

The MMI multimedia system stands out from 60,000–100,000 km with frozen screens and unresponsive controls. Multiple control modules can be affected.

The ZF 8-speed automatic shows harsh gear changes and gear selection problems at high mileage. Regular oil changes (every 80,000 km) are critical.

The MMI multimedia system is known for total failures caused by overvoltage damage after battery replacement or moisture damage to the Bluetooth control module.

The rubber-metal bushes of the front control arms on the heavy A8 D3 show significant wear at high mileage.