Wärtsilä said that the first ever Wärtsilä X72 mid-bore, low-speed engine has successfully passed the factory acceptance test. This milestone verifies that the engine fulfils the design criteria for performance and functioning, and that it has been accepted by the customer and the Lloyd's Register of Shipping classification society. The tests were carried out at the Doosan Engine Co. Ltd factory in South Korea, where the engines are being produced under license from Wärtsilä. Wärtsilä launched its low-speed Generation X engine series in May 2011. The Wärtsilä X72 engine offers exceptional efficiency and fuel consumption performance to provide a favourable Energy Efficiency Design Index (EEDI).