Engine Lubrication System (H4SO): General Description: Specification
GENERAL 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 | 78 x 10 mm (3.07 x 0.39 in) | |||
| Tip clearance between inner and outer rotors | Specification | 0.04 - 0.14 mm (0.0016 - 0.0055 in) | ||
| Limit | 0.18 mm (0.0071 in) | |||
| Side clearance between inner rotor and pump case | Specification | 0.02 - 0.07 mm (0.0008 - 0.0028 in) | ||
| Limit | 0.12 mm (0.0047 in) | |||
| Case clearance between outer rotor and pump case | Specification | 0.10 - 0.175 mm (0.0039 - 0.0069 in) | ||
| Limit | 0.20 mm (0.0079 in) | |||
| Performance (Oil temperature 80°C (176°F) | 600 rpm | Discharge pressure | 98 kPa (1.0 kgf/cm2 , 14 psi) | |
| Discharge rate | 4.6 l (4.9 US qt, 4.0 lmp qt)/min. | |||
| 5,000 rpm | Discharge pressure | 294 kPa (3.0 kgf/cm2 , 43 psi) | ||
| Discharge rate | 47.0 l (49.7 US qt, 41.4 lmp qt)/min. | |||
| Relief valve working pressure | 588 kPa (6.0 kgf/cm2 , 85 psi) | |||
| Oil filter | Filter type | Full-flow filter type | ||
| Filtration area | Outer diameter: 68 mm (2.68 in) | 800 cm2 (124 sq in) | ||
| Outer diameter: 65 mm (2.56 in) | 470 cm2 (73 sq in) | |||
| Bypass valve opening pressure | 160 kPa (1.63 kgf/cm2 , 23.2 psi) | |||
| Outer diameter x width | Outer diameter: 68 mm (2.68 in) | 68 x 65 mm (2.68 x 2.56 in) | ||
| Outer diameter: 65 mm (2.56 in) | 65 x 74.4 mm (2.56 x 2.93 in) | |||
| Installation bolt specifications | M 20 x 1.5 | |||
| Oil pressure switch | Type | Immersed contact point type | ||
| Operating voltage - wattage | 12 V - 3.4 W or less | |||
| Warning light operating pressure | 14.7 kPa (0.15 kgf/cm2 , 2.1 psi) | |||
| Proof pressure | 981 kPa (10 kgf/cm2 , 142 psi) or more | |||
| Engine oil | Capacity (at overhaul) | Non-turbo | 5.0 l (5.4 US qt, 4.5 lmp qt) | |
| Turbo | 5.0 l (5.4 US qt, 4.5 lmp qt) | |||
| When replacing engine oil and oil filter | Non-turbo | 4.2 l (4.4 US qt, 3.7 lmp qt) | ||
| Turbo | 4.3 l (4.5 US qt, 3.8 lmp qt) | |||
| When replacing engine oil only | Non-turbo | 4.0 l (4.2 US qt, 3.5 lmp qt) | ||
| Turbo | 4.0 l (4.2 US qt, 3.5 lmp qt) | |||
Recommended oil:
Items having the API standard SM "Energy Conserving" logo
ILSAC standard GF-4 "starburst mark" displayed on container top.
CAUTION:
It is acceptable to fill an engine with oil of another name when replacing oil, but use an API standard specified by Subaru or one that has SAE viscosity number.
NOTE:
Use an oil with the viscosity shown below if the vehicle is used in regions of high temperature, or in severe environments. API standard: SM or SL SAE viscosity No.: 30, 40, 10W-50, 20W-40, 20W-50