Subarus EE20 engine was a 20-litre horizontally-opposed or boxer four-cylinder turbo-diesel engine. We would like to show you a description here but the site wont allow us. For Australia the EE20 diesel engine was first offered in the Subaru BR Outback in 2009 and subsequently powered the Subaru SH Forester SJ Forester and BS OutbackThe EE20 diesel engine underwent substantial changes in 2014 to comply with Euro 6 emissions standards these changes.