The Volkswagen TDI (Turbocharged Direct Injection) is a line of diesel engines produced by Volkswagen for use in its vehicles. The TDI engine was introduced in the 1990s and has been used in a variety of Volkswagen models, including the Golf, Jetta, and Passat.

The TDI engine is known for its fuel efficiency and low emissions, as well as its durability. It is available in several different versions, ranging in size from 1.6 liters to 3.0 liters. The most common TDI engines are the 2.0-liter inline-four and the 3.0-liter V6 versions.

If you own a Volkswagen with a TDI engine and you are experiencing issues with it, or if it is time for regular maintenance, it is recommended that you take it to a professional mechanic or an auto repair shop that specialized in Volkswagen repair. They will be able to diagnose and fix any issues with your vehicle and keep it running smoothly.