Citroen upgrades diesel V6 to 240hp, 31mpg

High-efficiency diesel engines are the solution to near-term CO2 taxation and fuel efficiency rules for Europe, and Citroen doesn't want to be left behind. Accordingly, it has updated its diesel engine to a new 240hp (179kW), 3.0HDi specification.

That power rating, humble as it may seem alongside today's V8, V6 and even turbo four-cylinder offerings, is the highest power output ever for a production Citroen engine, according to the company. But despite the jump in power - 32hp (24kW) better than the 208hp (155kW) 2.7L unit it replaces - the engine is also about 15% more efficient.

Depending on the application, the engine is actually up to 17% more fuel efficient. The engine will be available both in the C5 and C6. Both vehicles average 31mpg US in the combined cycle, a 13% improvement for the C5 and a 17% improvement for the C6. Emissions were cut at similar rates, down to 195g/km for both cars. Particulate matter is trapped by a new Diesel Particulate Filter System (DPFS).

The engine will make its retail debut later this summer, more than a year ahead of the 2011 Euro V emissions mandates with which it complies.