The twin-turbochargers in Audi's 4.0L V8 engine can become starved of oil because of a clogged filter. This can cause strange acceleration noises, difficulty starting the engine, or sudden stalls.
An oil screen deep in the valley of the engine filters the oil before it goes to the turbochargers. The screen can become clogged in large part due to the filter's location and the difficulty of keeping it serviced.
The turbochargers are doomed once the oil stops flowing.
Federal Investigation Opened ∞
The National Highway Traffic Safety Administration (NHTSA) opened an investigation into turbocharger failures following complaints from owners who had their engines suddenly stall without any warning.
The investigation covers:
- 2013-2016 A8
- 2013-2016 S6
- 2013-2016 S7
- 2013-2016 S8
- 2013-2016 RS7
Damaged Turbocharger Service Bulletin (TSB) ∞
Audi released TSB 2044640 titled Engine difficult to start, turbocharger damaged, V8 4.0TFSI addressing the complaints about the engine being difficult to start, making unusual noises during acceleration, or has reduced performance.
In addition to the models listed in the investigation, the service bulletin also covers the 2013-2016 RS6.
Technicians are advised to look for the following damage:
- Damage to the turbocharger impeller fins
- Increased free play on the turbocharger impeller shaft
- Broken turbocharger impeller shaft
Finding where the damage comes from ∞
Audi says damage to the turbocharger is rarely a result of the actual part failing, but rather the result of poor service, an incorrectly fitted oil filter element, leaks in the intake tract allowing debris into the charger, or a poor oil supply to the turbocharger.
Header photo by Remy Lovesy on Unsplash