Subaru WRX STI
Data verified by Nick Marchenko, PhD
The 2015–2021 Subaru WRX STI is equipped with a powerful EJ257 Turbo engine, a 2.5L I-4 petrol engine that delivers an impressive 305 hp and 290 lb-ft of torque. For optimal performance, it is crucial to maintain the correct oil specifications. This model requires 4.5 quarts of 5W-30 engine oil, ensuring smooth operation and longevity of the engine. Regular oil changes are essential to keep the engine running efficiently.
In addition to oil maintenance, the Subaru WRX STI has a coolant capacity of 8.1 quarts. Proper coolant levels help in regulating the engine temperature, preventing overheating during high-performance driving. Whether you're using your WRX STI for daily commuting or spirited driving, adhering to these maintenance guidelines will ensure your vehicle performs at its best.
Subaru WRX STI Oil Capacity
| Engine | Oil Capacity | Viscosity | Coolant | Years |
|---|---|---|---|---|
| EJ257 Turbo EJ EJ25 The EJ257 Turbo engine has a displacement of 2.5L I-4. The power output is 305 hp with a torque of 290 lb-ft. | 4.5 qt | 5W-30 | 8.1 qt | 2021, 2020, 2019, 2018, 2017, 2016, 2015 |
Subaru WRX STI – Frequently Asked Questions
How many quarts of oil does the Subaru WRX STI take?
The Subaru WRX STI with the EJ257 Turbo engine requires 4.5 quarts of oil including the filter. Always verify the capacity on the oil filler cap or in the owner's manual before service.
What type of oil does the Subaru WRX STI use?
The Subaru WRX STI uses 5W-30 engine oil across all its engine variants. Full synthetic oil meeting API/ILSAC specifications is strongly recommended for optimal engine protection and performance.
What is the coolant capacity of the Subaru WRX STI?
The Subaru WRX STI cooling system holds approximately 8.1 quarts (full system capacity). Always use the coolant type specified by the manufacturer and ensure the system is properly bled of air after any service.
What type of oil does the Subaru WRX STI use?
The Subaru WRX STI uses 5W-30 engine oil for optimal performance.
How many quarts of oil does the Subaru WRX STI take?
The Subaru WRX STI has an oil capacity of 4.5 quarts.
How often should I change oil in a Subaru WRX STI?
It is recommended to change the oil in your Subaru WRX STI every 6,000 miles or every six months, whichever comes first, to maintain engine health.
What is the coolant capacity of the Subaru WRX STI?
The coolant capacity of the Subaru WRX STI is 8.1 quarts.
Does the Subaru WRX STI need synthetic oil?
While the Subaru WRX STI can run on conventional oil, using synthetic oil is recommended for better performance and engine protection.
What happens if I use the wrong oil viscosity in my Subaru WRX STI?
Using the wrong oil viscosity can lead to inadequate lubrication, increased engine wear, and potential overheating, impacting overall performance.
What is an oil life monitor and how does it work?
An oil life monitor tracks the condition of the engine oil and alerts you when it's time for an oil change based on driving habits and conditions.
Can I mix synthetic and conventional oil?
While it is technically possible to mix synthetic and conventional oil, it is not recommended as it can reduce the effectiveness of the oil.
How do I know if my Subaru WRX STI has an oil leak?
Signs of an oil leak include oil spots under the vehicle, a burning oil smell, or a drop in oil levels on the dipstick.
What causes excessive oil consumption?
Excessive oil consumption can be caused by worn piston rings, valve seals, or other engine components that may need repair or replacement.
Should I check my oil when the engine is hot or cold?
It's best to check your oil when the engine is cold, as this provides a more accurate reading on the dipstick.
What is the difference between an oil change and a flush?
An oil change involves draining the old oil and replacing it with new oil, while a flush cleans the engine internally and removes sludge and deposits.