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.
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HOMESERVICE MANUALSSUBARU2016LEGACY 2.5IREPAIR AND DIAGNOSISENGINE MECHANICALENGINE LUBRICATION SYSTEM (H4DO)GENERAL DESCRIPTIONSPECIFICATION
2016 Subaru Legacy 2.5i
Engine Lubrication System (H4DO): General Description: Specification
2016 Subaru Legacy 2.5iSECTION Specification
| 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) | 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 | 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.
| Engine oil standard | SAE viscosity No. | ||
|---|---|---|---|
|
Those with SN "Resource Conserving" logo in case of API standard. |
or |
Those with GF-5 "starburst mark" displayed on top of the container in case of ILSAC standard. |
OW-20 (synthetic oil) |
NOTE:
The proper viscosity oil helps the engine maintain its ideal temperature, and cranking speed increased by reducing viscosity friction in hot condition.
RENDER: 1.0x
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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.