Subaru''s EZ30R was a 3.0-litre horizontally-opposed (or ''boxer'') six-cylinder petrol engine. Replacing Subaru''s EZ30D, the EZ30R engine was first introduced in the Subaru BP Outback 3.0R in 2003 and subsequently offered in the Subaru BL/BP Liberty 3.0R and Subaru Tribeca pared to the EZ30D engine, changes for the EZ30R included: A lighter cylinder head and block by ''eliminating excessive ...