AdBlue helps Audi achieve Tier II Bin 5 compliance Audi has unveiled its first Tier II Bin 5 compliant diesel engine, entering series production in 2008 for European and US markets. Initially the clean-diesel technology will be limited to Audi's three-litre V6 TDI engine for use in the Audi A4 and Audi Q7. By 2010 Audi aims to extend the use of clean-diesel technology to other vehicle classes. As part of the BlueTec consortium Audi will use advanced combustion technology coupled with downstream exhaust aftertreatment and an AdBlue dosing system. Turbocharging, common-rail injection and EGR will bring about a reduction in raw emissions. An extensive aftertreatment package including a two-way catalyst, DPF and a urea-SCR system will reduce levels of NOx and PM below the world's most stringent emissions limits. It would appear that Audi has developed this system with one eye on the impending European 130g/km CO2 limit, planning to increase fuel efficiency across its range with advanced diesel technology. | 
