Mercedes-Benz OM668 engine

The Mercedes-Benz OM668 is a 1.7 litre (1,689 cc) diesel inline-four engine built by Mercedes-Benz and used in the A-Class W168 from 1997 to 2004 and in the W414 Vaneo from 2001 to 2005. It uses common rail injection, a turbocharger on every version and an intercooler on all but the 44 kW variant, and compared with the petrol M166 it has four valves per cylinder and two chain-driven overhead camshafts. In 1997 it was the smallest diesel Mercedes-Benz had made. Software alone can lift output to 88 kW without hurting durability, though the extra torque of up to 200 newton metres may wear the A-Class clutch faster. It later developed into the Thielert Centurion 1.7 aircraft engine and also powered the Rinspeed Presto concept car.