Wärtsilä has introduced a new four-stroke, dual-fuel engine, the 46DF medium-speed engine. Compared to any other alternative currently available on the market its specific fuel consumption is lower, output is higher, and lifecycle costs are attractive, according to the company. The Wärtsilä 46DF extends Wärtsilä’s dual-fuel engine family by covering the power range from 6.2 MW to 18.3 MW at 600 rpm.