Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2020 Subaru Legacy BaseFACTORY OEM SERVICE PROCEDURE
Engine Lubrication System (2.5L): General Description: Specification
| Lubrication method | Forced lubrication type | ||||
| Oil pump | Pump type | Trochoid type | |||
| Number of teeth | pcs. | Inner rotor | 10 | ||
| Outer rotor | 11 | ||||
| Outer rotor diameter x Thickness | mm (in) | 71.4 x 14 (2.81 x 0.55) | |||
| Performance (Oil temperature 120°C (248°F)) | 600 r/min | Discharge pressure | kPa (kg/cm2 , psi) | 34 (0.3, 4.9) | |
| 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) | 298 (3.0, 43.2) | ||
| Discharge rate | L (US qt, Imp qt)/min | 46.6 (49.3, 41.0) 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) | 700 (7.1, 101.5) | |||
| Oil filter | Filter type | Full-flow filter type | |||
| Filtration area | cm2 (sq in) | 867 (134.3) | |||
| By-pass valve opening pressure | kPa (kg/cm2 , psi) | 160 (1.6, 23.2) | |||
| Outer diameter x Width | mm (in) | 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 | V | 12 | |||
| Warning light operating pressure | kPa (kg/cm2 , psi) | 14.7 (0.1, 2.1) | |||
| Proof pressure | kPa (kg/cm2 , psi) | 981 (10.0, 142.2) | |||
| Engine oil | Total capacity (at overhaul) | L (US qt, Imp qt) | 5.1 (5.4, 4.5) | ||
| When replacing engine oil and oil filter | L (US qt, Imp qt) | 4.2 (4.4, 3.7) | |||
| When replacing engine oil only | L (US qt, Imp qt) | 4.0 (4.2, 3.5) | |||
Engine oil:
Refer to "RECOMMENDED MATERIALS" for engine oil. Refer to RECOMMENDED MATERIALS>GREASE>ENGINE OIL .
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.