Turbo Model

Install in the reverse order of removal.
Contact the knock pin (A) of adapter (1) to cylinder block rib (B) to install adapter (1).

Fig 1: Contacting Knock Pin Of Adapter To Cylinder Block Rib
Courtesy of SUBARU OF AMERICA, INC.
Install the adapter (2).
Contact the engine oil cooler stopper (A) to adapter (2) rib (B) to install engine oil cooler.

Fig 2: Contacting Engine Oil Cooler Stopper
Courtesy of SUBARU OF AMERICA, INC.
Apply liquid gasket to the plug thread when installing it.
Liquid gasket:

THREE BOND 1215 (Part No. 004403007) or equivalent

Tightening torque:

T1: 45 N.m (4.6 kgf-m, 33.2 ft-lb)

T2: 6.4 N.m (0.65 kgf-m, 4.7 ft-lb)

T3: 54 N.m (5.5 kgf-m, 40 ft-lb)

T4: 69 N.m (7.0 kgf-m, 51 ft-lb)

NOTE: Always use a new O-ring.

Fig 3: Applying Liquid Gasket To Plug Thread
Courtesy of SUBARU OF AMERICA, INC.