Wartsila teams with Knutsen OAS for first ammonia engine test 30 June 2020 Partners claim world first with long-term trial of sustainable four-stroke propulsion systemAuthor: Capt. Johnhttps://www.tradewindsnews.com/technology/wartsila-teams-with-knutsen-oas-for-first-ammonia-engine-test/2-1-835003