TDI is used on all current Volkswagen Group diesel engines, so you'll see those three letters if you're interested in new or used diesel Audi, Volkswagen, SEAT, Skoda, Porsche or Bentley models. You might think the 'D' in TDI stands for 'diesel', but in fact the acronym is short for 'Turbocharged Direct Injection'.

TDI engines will typically have better fuel economy compared to a TSI (especially if you do lots of long motorway journeys), as is usually the case with any diesel engine compared to petrol. TDIs tend to be more expensive to purchase though, and the fuel itself typically costs more per litre.

TDI is used on all current Volkswagen Group diesel engines, so you'll see those three letters if you're interested in new or used diesel Audi, Volkswagen, SEAT, Skoda, Porsche or Bentley models. You might think the 'D' in TDI stands for 'diesel', but in fact the acronym is short for 'Turbocharged Direct Injection'.

The 1.9 is slightly more economical, the 2.0 is quicker revving, smoother, faster, quieter. The 1.9 only has a 5 speed box though. The 2.0 doesn't pull quite as well from low revs (the 1.9 is like a tank) but is less peaky. Given the choice I took the 2.0TDI and I don't regret it at all.

They also make a 1.6L TDI and a 4.2L V8 TSI, so Tsi is faster. And they make lots in between. If you compare both V8's, they are both limited to 250 km/h.

The Audi TDI clean diesel represents the optimum exhaust gas aftertreatment technology that is currently possible in series production. The accustomed economy of the TDI® and the efficient minimising of emissions by the ultra low emission system result in an economical and clean-running powerplant.

The vehicle can run without an efficiently functioning turbocharger, but it will perform poorly, and your decision could possibly have dramatic repercussions.

Volkswagen 1.9L ALH TDI Diesel While Volkswagen has produced many very good diesel engines over the years, the “ALH” engine used between 1998 and 2006 is regarded as one of the best.

The 1.9 TDI engine was known for its good fuel efficiency and reliability, and it was popular among consumers and automotive experts alike. One of the key features of the 1.9 TDI engine was its use of direct injection technology, which allowed for more precise fuel delivery and improved fuel efficiency.

TDI engines will typically have better fuel economy compared to a TSI (especially if you do lots of long motorway journeys), as is usually the case with any diesel engine compared to petrol. TDIs tend to be more expensive to purchase though, and the fuel itself typically costs more per litre.

TDI engines boast many of the same benefits as the TFSI engines, such as: Superior torque and efficiency – TDI engines generate high torque and low revs, making them fantastic for long trips. Greater fuel efficiency – helping to contribute to longer driving ranges. Renowned for their robustness and longevity.

Specifically, clean diesel includes 97 percent less sulfur than traditional diesel. As sulfur is one of the leading contributors to pollution from diesel fuel, clean diesel significantly reduces pollutants emitted by diesel engines.