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.
2018 Subaru WRX STIFACTORY OEM SERVICE PROCEDURE
Quick Lookups: Fluids
| FLUID CAPACITIES | |||||||
|---|---|---|---|---|---|---|---|
| Fluid Type | Application | Standard | Metric | Fluid Spec | Note | S/H | |
| Air Cond Compressor Oil | 3.55 OZS. | 0.1 L | DH-PR (ZXL200PG) | S | |||
| Air Cond Refrigerant | 1.05 LBS. | 0.47 KG | HFC-134a | S | |||
| Automatic Transmission Fluid | 13.10 QTS. | 12.39 L | SUBARU High Torque CVT Fluid | S | |||
| Brake Fluid | N/A | N/A | FMVSS No. 116 DOT 3 or DOT 4 Brake Fluid | S | |||
| Clutch Fluid | N/A | N/A | FMVSS No. 116 DOT 3 or DOT 4 Brake Fluid | S | |||
| Differential Gear Oil | STI,STI Limited,STI Type RA | Rear | 1.10 QTS. | 1.04 L | API - GL-5, SAE 75W-90 gear Oil | S | |
| Engine Coolant | STI,STI Limited,STI Type RA | 8.20 QTS. | 7.76 L | SUBARU Super Coolant | S | ||
| Engine Oil | STI,STI Limited,STI Type RA | Drain and Refill,w/Filter | 4.50 QTS. | 4.25 L | API SN or SM, ILSAC GF-5 or GF-4 SAE 5W-30 Synthetic Oil Specified | S | |
| Engine Oil | STI,STI Limited,STI Type RA | Drain and Refill,w/o Filter | 4.20 QTS. | 3.97 L | API SN or SM, ILSAC GF-5 or GF-4 SAE 5W-30 Synthetic Oil Specified | S | |
| Fuel Tank | 15.90 GALS. | 60.18 L | S | ||||
| Manual Transmission Fluid | STI,STI Limited,STI Type RA | 4.30 QTS. | 4.06 L | API - GL-5, SAE 75W-90 | S | ||
| Power Steering Fluid | 0.70 QTS. | 0.66 L | SUBARU Automatic Transmission Fluid | S | |||
| Windshield Washer Fluid | N/A | N/A | Windshield Washer Fluid | S | |||
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.
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