Engine Lubrication System (H4DO): General Description: Specification

Non-turbo model

Lubrication method					Forced lubrication
Oil pump	Pump type				Trochoid type
	Number of teeth	Inner rotor			11
		Outer rotor			12
	Outer rotor diameter x Thickness			mm (in)	77 x 12 (3.03 x 0.47)
	Performance (Oil temperature 120°C (248°F))	600 r/min	Discharge pressure	kPa (kg/cm² , psi)	40 (0.4, 5.8)
			Discharge rate	L (US qt, Imp qt)/min	5.8 (6.1, 5.1) or more
		6.000 r/min	Discharge pressure	kPa (kg/cm² , psi)	323 (3.3, 46.8)
			Discharge rate	L (US qt, Imp qt)/min	55 (58.1, 48.4) or more
	Relief valve working pressure (2-step relief)	1st opening pressure		kPa (kg/cm² , psi)	150 (1.5, 21.7)
		Main opening pressure		kPa (kg/cm² , psi)	570 (5.8, 82.6)
Oil filter	Filter type				Full-flow filter type
	Filtration area	cm² (sq in)	Outer diameter: 68 mm (2.68 in) (black)		1, 100 (171)
			Outer diameter: 67.4 mm (2.6 in) (blue)		867 (134.3)
	By-pass valve opening pressure			kPa (kg/cm² , psi)	160 (1.6, 23.2)
	Outer diameter x Width	mm (in)	Outer diameter: 68 mm (2.68 in) (black)		68 x 85 (2.68 x 3.35)
			Outer diameter: 67.4 mm (2.6 in) (blue)		67.4 x 87.1 (2.65 x 3.43)
	Installation screw specifications				M 20 x 1.5
Oil pressure switch	Type				Immersed contact point type
	Operating voltage				12 V
	Warning light operating pressure			kPa (kg/cm² , psi)	14.7 (0.1, 2.1)
	Proof pressure			kPa (kg/cm² , psi)	981 (10, 142.2)
Engine oil	Total capacity (at overhaul)			L (US qt, Imp qt)	5.7 (6.0, 5.0)
	When replacing engine oil and oil filter			L (US qt, Imp qt)	4.8 (5.1, 4.2)
	When replacing engine oil only			L (US qt, Imp qt)	4.6 (4.9, 4.0)

Specified oil:

CAUTION:

Use 0W-20 (synthetic oil).
It is acceptable to fill an engine with oil of another brand when replacing the oil, but make sure to use the following engine oil specified by Subaru.

NOTE: The proper viscosity oil helps the engine maintain its ideal temperature, and cranking speed increased by reducing viscosity friction in hot condition.

Engine oil standard			SAE viscosity No.
Courtesy of SUBARU OF AMERICA, INC. Those with SN "Resource Conserving" logo in case of API standard.	or	Courtesy of SUBARU OF AMERICA, INC. Those with GF-5 "starburst mark" displayed on top of the container in case of ILSAC standard.	0W-20 (synthetic oil)

Turbo model

Lubrication method					Forced lubrication
Oil pump	Pump type				Trochoid type
	Number of teeth	Inner rotor			11
		Outer rotor			12
	Outer rotor diameter x Thickness			mm (in)	77 x 14 (3.03 x 0.55)
	Performance (Oil temperature 120°C (248°F))	600 r/min	Discharge pressure	kPa (kg/cm² , psi)	35 (0.4, 5.1)
			Discharge rate	L (US qt, Imp qt)/min	7.4 (7.8, 6.5) or more
		6.700 r/min	Discharge pressure	kPa (kg/cm² , psi)	321 (3.3, 46.6)
			Discharge rate	L (US qt, Imp qt)/min	60.2 (63.6, 53.0) or more
	Relief valve working pressure		-	kPa (kg/cm² , psi)	700 (7.1, 102)
Oil filter	Filter type				Full-flow filter type
	Filtration area	cm² (sq in)	Outer diameter: 68 mm (2.68 in) (black)		1, 100 (171)
			Outer diameter: 67.4 mm (2.6 in) (blue)		867 (134.3)
	By-pass valve opening pressure			kPa (kg/cm² , psi)	160 (1.6, 23.2)
	Outer diameter x Width	mm (in)	Outer diameter: 68 mm (2.68 in) (black)		68 x 85 (2.68 x 3.35)
			Outer diameter: 67.4 mm (2.6 in) (blue)		67.4 x 87.1 (2.65 x 3.43)
	Installation screw specifications				M 20 x 1.5
Oil pressure switch	Type				Immersed contact point type
	Operating voltage				12 V
	Warning light operating pressure			kPa (kg/cm² , psi)	14.7 (0.1, 2.1)
	Proof pressure			kPa (kg/cm² , psi)	981 (10, 142.2)
Engine oil	Total capacity (at overhaul)			L (US qt, Imp qt)	6.0 (6.3, 5.3)
	When replacing engine oil and oil filter			L (US qt, Imp qt)	5.1 (5.4, 4.5)
	When replacing engine oil only			L (US qt, Imp qt)	4.9 (5.2, 4.3)

Specified oil:

CAUTION:

Use 5W-30 (synthetic oil).
It is acceptable to fill an engine with oil of another brand when replacing the oil, but make sure to use the following engine oil specified by Subaru.
Do not use 0W-20 for turbo model. If used for turbo model, it may lead to trouble.

NOTE: The proper viscosity oil helps the engine maintain its ideal temperature, and cranking speed increased by reducing viscosity friction in hot condition.

Engine oil standard			SAE viscosity No.
Courtesy of SUBARU OF AMERICA, INC. Those with SN "Resource Conserving" logo in case of API standard.	or	Courtesy of SUBARU OF AMERICA, INC. Those with GF-5 "starburst mark" displayed on top of the container in case of ILSAC standard.	5W-30 (synthetic oil)