What is the most common issue with turbochargers in an Audi A6?

I've noticed that my Audi A6's turbocharger is not functioning as efficiently as it used to. What could be causing this? Are there any preventive measures I can take to ensure the longevity of my turbocharger?

The most common issue with turbochargers in Audi A6 models is either wear and tear due to regular use, or a lack of proper maintenance. It is important to regularly check the turbocharger for any signs of damage, and make sure to replace worn out parts before they cause major issues. It is also recommended to use high-quality engine oil and avoid revving the engine excessively to maintain the turbocharger's lifespan.