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Wärtsilä 31 - the most efficient 4-stroke marine engine
WARTSILA 31 PRODUCT MANUAL Pdf Download | ManualsLib
Meet Wärtsilä 31 – The World’s Most Efficient Engine
Wärtsilä 31SG marine spark gas engine
The World-Record-Holding Wartsila 31 Diesel Engine - MotorTrend
Wärtsilä's new 31 becomes the most efficient 4-stroke ... - New Atlas
The record-breaking Wärtsilä 31 engine gets a power boost
Wärtsilä 31 Achieves Guinness World Record For Diesel Efficiency