In the United States, the EZ30 was introduced in the Outback H6-3.0 in November 2000 for the 2001 model year.
In Japan, the EZ30 was introduced in the equivalent Lancaster 6 wagon in May 2000.
A twin-turbo version of the EZ30 was produced for the Subaru B11S concept car, unveiled at Geneva in 2003.
 The EZ30 was refreshed in 2003, and when the Tribeca was introduced for the 2006 model year in January 2005, the EZ30 II was the sole engine option.

The EZ36 was introduced with the restyled Tribeca for the 2008 model year, and replaced the 3.0 L EZ30 in the Legacy and Outback starting in 2009 for the 2010 model year.

Starting with the 2020 model year, the six-cylinder EZ36 was dropped as the uplevel engine option for Subaru Legacy and Outback automobiles and instead the premium engine offered was the turbocharged four-cylinder FA24F, which was previously introduced for the 2019 model year as the sole engine option for the Subaru Ascent, the successor to the Tribeca.

Notes
Fitted to 2003 concept Subaru B11S only, never produced in volume.

Torque peak between 3,600 and 4,800 RPM.

Sometimes misidentified as "EZ30R".
Subaru never designated an engine with this code.
Revisions include the addition of variable valve timing (intake) and three exhaust ports per cylinder head.
In the United States, the EZ30 was introduced in the Outback H6-3.0 in November 2000 for the 2001 model year. In Japan, the EZ30 was introduced in the equivalent Lancaster 6 wagon in May 2000. A twin-turbo version of the EZ30 was produced for the Subaru B11S concept car, unveiled at Geneva in 2003.  The EZ30 was refreshed in 2003, and when the Tribeca was introduced for the 2006 model year in January 2005, the EZ30 II was the sole engine option.
The EZ36 was introduced with the restyled Tribeca for the 2008 model year, and replaced the 3.0 L EZ30 in the Legacy and Outback starting in 2009 for the 2010 model year.
Starting with the 2020 model year, the six-cylinder EZ36 was dropped as the uplevel engine option for Subaru Legacy and Outback automobiles and instead the premium engine offered was the turbocharged four-cylinder FA24F, which was previously introduced for the 2019 model year as the sole engine option for the Subaru Ascent, the successor to the Tribeca.
Notes
Fitted to 2003 concept Subaru B11S only, never produced in volume.
Torque peak between 3,600 and 4,800 RPM.
Sometimes misidentified as "EZ30R". Subaru never designated an engine with this code. Revisions include the addition of variable valve timing (intake) and three exhaust ports per cylinder head.
Subaru six-cylinder engines