The New Audi A4 3.0 TDI Clean Diesel Quattro
Published: 6th March 2009
The Audi A4
Audi debuted the 3.0 TDI clean diesel engine in the Audi Q7 SUV; now, the world's cleanest diesel technology will also be available in the best-selling Audi A4. A package of technologies provides innovative solutions for engines and the after-treatment of exhaust gas.
The engine features a new common-rail injection system (which generates up to 2,000 bars of pressure), innovative pressure sensors in the combustion chamber, and an especially high-performance exhaust recirculating system. Collectively these measures ensure a highly efficient and low-emission combustion process. A novel DeNOX catalytic converter, integrated within the end of the exhaust system, reduces residual nitrogen oxides. Just upstream of it, a pump injects an additive named AdBlue into the hot exhaust flow; there, this aqueous solution decomposes into ammonia - which splits the nitrogen oxides into nitrogen and water.
The Audi A4 3.0 TDI clean diesel quattro already complies with the emission limits of the EU's Euro 6 standard, expected to become law in 2014. It is also very fuel-efficient, with the potential to cover up to 42.1mpg (Avant: 41.5mpg). And this TDI engine is indeed a powerful performer, needing only 6.2 seconds (Avant: 6.3 seconds) to go from zero to 62mph. Top speed is electronically governed to 155mph. In conjunction with a six-speed tiptronic and quattro permanent all-wheel drive, this vehicle guarantees a high degree of comfort and superior traction.
Audi A4
Our Audi A4 Guide lists the full specification of the current UK A4 range, including car prices, fuel consumption, dimensions and other vital data.
Price Range: £20,490 - £33,705
Body Style:
Fuel:
/ 
/ 
Models in the range: 53
We have road tested the Audi A4, to read our in-depth car reviews:
Audi A4 Review - Dec 2006
Audi A4 Review - Jul 2008
Our Car Buyer’s Guide covers all of the UK’s major new cars and includes CO2 ratings and car insurance groups. Data updated on the 14th Oct 2009
