Engine Lubrication System - Lubrication (H4SO - 2.5L SOHC): General Description: Specification

2.5 L non-turbo model

ITEM SPECIFICATION

Lubrication method						Forced lubrication
Oil pump	Pump type					Trochoid type
	Number of teeth	Inner rotor				9
		Outer rotor				10
	Outer rotor diameter x thickness				mm (in)	76 x 10 (2.99 x 0.39)
	Tip clearance between inner and outer rotors		mm (in)	Standard		0.04 - 0.14 (0.0016 - 0.0055)
	Case clearance between outer rotor and pump case		mm (in)	Standard		0.10 - 0.175 (0.0039 - 0.0069)
	Side clearance between inner rotor and pump case		mm (in)	Standard		0.02 - 0.07 (0.0008 - 0.0028)
	Relief valve spring	Free length			mm (in)	73.7 (2.902)
		Installed length			mm (in)	54.7 (2.154)
		Load when installed			N (kgf, lbf)	93.1 (9.49, 20.93)
	Performance (Oil temperature 80°C (176°F))	600 rpm	Discharge pressure		kPa (kgf/cm² , psi)	98 (1.0, 14)
			Discharge rate		l (US qt, lmp qt)/min.	4.6 (4.9, 4.0) or more
		5,000 rpm	Discharge pressure		kPa (kgf/cm² , psi)	294 (3.0, 43)
			Discharge rate		l (US qt, lmp qt)/min.	47.0 (49.7, 41.4) or more
	Relief valve working pressure				kPa (kgf/cm² , psi)	588 (6.0, 85)
Oil filter	Filter type					Full-flow filter type
	Filtration area	cm² (sq in)	Outer diameter: 68 mm (2.68 in) (black)			800 (124)
			Outer diameter: 67.4 mm (2.65 in) (blue)			555 (86)
	By-pass valve opening pressure				kPa (kgf/cm² , psi)	160 (1.63,23.2)
	Outer diameter x width	mm (in)	Outer diameter: 68 mm (2.68 in) (black)			68 x 65 (2.68 x 2.56)
			Outer diameter: 67.4 mm (2.65 in) (blue)			67.4 x 65.3 (2.65 x 2.57)
	Installation screw specifications					M 20 x 1.5
Oil pressure switch	Type					Immersed contact point type
	Operating voltage - power consumption					12 V - 3.4 W or less
	Warning light operating pressure				kPa (kgf/cm² , psi)	14.7 (0.15,2.1)
	Proof pressure				kPa (kgf/cm² , psi)	981 (10,142) or more
Engine oil	Total capacity (at overhaul)				l (US qt, lmp qt)	4.8 (5.1, 4.2)
	When replacing engine oil and oil filter				l (US qt, lmp qt)	4.2 (4.4, 3.7)
	When replacing engine oil only				l (US qt, lmp qt)	4.0 (4.2, 3.5)

Turbo model

OIL PUMP SPECIFICATION

Lubrication method						Forced lubrication
Oil pump	Pump type					Trochoid type
	Number of teeth	Inner rotor				9
		Outer rotor				10
	Outer rotor diameter x thickness				mm (in)	78 x 11 (3.07 x 0.43)
	Tip clearance between inner and outer rotors		mm (in)	Standard		0.04 - 0.14 (0.0016 - 0.0055)
	Case clearance between outer rotor and pump case		mm (in)	Standard		0.10 - 0.175 (0.0039 - 0.0069)
	Side clearance between inner rotor and pump case		mm (in)	Standard		0.02 - 0.07 (0.0008 - 0.0028)
	Relief valve spring	Free length			mm (in)	73.7 (2.902)
		Installed length			mm (in)	54.7 (2.154)
		Load when installed			N (kgf, lbf)	93.1 (9.49, 20.93)
	Performance (Oil temperature 80°C (176°F))	600 rpm	Discharge pressure		kPa (kg/cm² , psi)	98 (1.0,14)
			Discharge rate		l (US qt, lmp qt)/min.	6.4 (6.8, 5.6) or more
		6,000 rpm	Discharge pressure		kPa (kg/cm² , psi)	392 (4.0, 56.8)
			Discharge rate		l (US qt, lmp qt)/min.	63.0 (66.6, 55.4) or more
	Relief valve working pressure				kPa (kg/cm² , psi)	538 (5.5, 78)
Oil filter	Filter type					Full-flow filter type
	Filtration area	cm² (sq in)	Outer diameter: 68 mm (2.68 in) (black)			800 (124)
			Outer diameter: 67.4 mm (2.65 in) (blue)			555 (86)
	By-pass valve opening pressure				kPa (kg/cm² , psi)	160 (1.63, 23.2)
	Outer diameter x width	mm (in)	Outer diameter: 68 mm (2.68 in) (black)			68 x 65 (2.68 x 2.56)
			Outer diameter: 67.4 mm (2.65 in) (blue)			67.4 x 65.3 (2.65 x 2.57)
	Installation screw specifications					M 20 x 1.5
Oil pressure switch	Type					Immersed contact point type
	Operating voltage - power consumption					12 V - 3.4 W or less
	Warning light operating pressure				kPa (kg/cm² , psi)	14.7 (0.15,2.1)
	Proof pressure				kPa (kg/cm² , psi)	981 (10,142) or more
Engine oil	Total capacity (at overhaul)				l (US qt, lmp qt)	5.2 (5.5, 4.6)
	When replacing engine oil and oil filter				l (US qt, lmp qt)	4.3 (4.5, 3.8)
	When replacing engine oil only				l (US qt, lmp qt)	4.0 (4.2, 3.5)

Recommended oil:

Oil corresponding to either of the following standards.

Those with SM "Energy Conserving" logo in case of API standard.
Those with GF-4 "starburst mark" displayed on top of the container in case of IL-SAC standard.

Fig 1: SAE Viscosity Chart
Courtesy of SUBARU OF AMERICA, INC.

CAUTION: It is acceptable to fill an engine with oil of another brand when replacing the oil, but make sure to use an oil with an API standard and SAE viscosity number 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.
If the vehicle is used in regions of high temperatures or in other severe environments, use oil with the viscosities shown below.

API standard: SM or SL

SAE viscosity No. 30, 40, 10W-50, 20W-40, 20W-50