The Skoda Superb is now available with a 140bhp 2.0-litre TDI CR DPF common-rail diesel engine.
The unit replaces the 140bhp TDI PD.
Average fuel consumption is boosted by 4.4mpg to 52.3mpg, while CO2 emissions have been cut by 12g/km to 143g/km.
The standard diesel particulate filter (DPF) ensures it's compliant with Euro V emissions regulations.
Prices will still start at £18,205 – the same as the outgoing engine.
The new model comes with a choice of manual or DSG semi-automatic transmissions, and in S, SE, or Elegance trim.