Subaru's EZ30D was a 3.0-litre horizontally-opposed (or 'boxer') six-cylinder petrol engine. For Australia, the EZ30D engine was solely available on the Subaru BH Outback from 2000-03.

Subaru's EE20 engine was a 2.0-litre horizontally-opposed (or 'boxer') four-cylinder turbo-diesel engine. 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 Outback.The EE20 diesel engine underwent substantial changes in 2014 to comply with Euro 6 emissions standards – …