The Wärtsilä 31, an engine which was presented last year, is the most efficient four-stroke diesel engine in the world. After being entered into the Guinness Book of Records, it has received the Marine Engines Award.
Since the engine is manufactured in three versions, several types of fuel may be used for it, from light to heavy diesel fuels of different quality. It is intended to be a driving engine for ships which require a power of approximately 4.2 to 9.8 MW. Another advantage is that it requires maintenance every 8000 hours, as opposed to other marine engines, which require maintenance already after 2000 hours.