Own a Audi model with the 2.0 TFSI engine? – Read on, we may be able to save you and your car from some real headaches. These engine seem to have developed a chronic problem with carbon deposits on the intake valves, which can lead to a very expensive repair. This carbon build up on the valves is caused by the direct injection, a common issue with engines of this type. It happens because the fuel is not being injected over the valves, this would keep the valves nice and clean. A secondary issue may also be the crankcase ventilation system, and the use of low quality engine oils.
They say prevention is better than cure so what can be done to prevent this carbon build up issue. Using good quality clean burn fuel free of bio elements, the higher octane fuels also tend to burn cleaner. Get the engine up to temperature as soon as you can (don’t idle it but just drive it steadily at around 2000rpm till it warms up) and keep the engine operating at 3000rpm for 15 minutes per week. At this RPM range the engine is designed to run hotter and this can help burn off some of the carbon deposits. Be sure to always use a OEM quality full synthetic engine oil, and change the oil often, no more than every 5,000 to 7,500 miles.
Driving the engine at just over 3000 RPM raises the temperature and puts the engine into a “cleaning mode” where it runs leaner and hotter clearing out a lot of the carbon build up inside the engine, so try to hit this sweet spot as often as you can and for at least 15 minutes per week. An ounce of prevention, always worth a pound of cure!