The Austro Engine E4 (marketed as the AE 300) is a liquid-cooled, inline, four-cylinder, four-stroke, aircraft diesel engine.
[2][3] The engine is manufactured by Austro Engine, an Austrian-based company and subsidiary of Diamond Aircraft Industries.
[4] Following Diamond's "General Aviation Single Point of Contact" strategy, Austro Engine started to design a new engine for use on Diamond products in 2005.
It received its type certificate in January 2009.
[2] Data from Austro Engine and type certificate[1][2][3]