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.
2021 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
WRX STI: Capacity
| Model | 2.5 L DOHC high power turbo | ||
| Fuel tank | L (US gal, Imp gal) | 60 (15.9, 13.2) | |
| Engine oil | Total capacity (at overhaul) | 5.0 (5.3, 4.4) | |
| L (US qt, Imp qt) | |||
| Filling amount of engine oil | When replacing engine oil and oil filter | 4.3 (4.5, 3.8) | |
| L (US qt, Imp qt) | When replacing engine oil only | 4.0 (4.2, 3.5) | |
| Transmission gear oil | L (US qt, Imp qt) | 4.1 (4.3, 3.6) | |
| Rear differential gear oil | L (US qt, Imp qt) | 1.0 (1.1, 0.9) | |
| Power steering fluid | L (US qt, Imp qt) | 0.7 (0.7, 0.6) | |
| Engine coolant | L (US qt, Imp qt) | 7.7 (8.2, 6.8) | |
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.