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In the 2018 Subaru WRX STI, the oil capacity is 4.5 quarts. Issues with the oil may arise over time, including a foul burning odor which should be addressed promptly to prevent potential danger such as engine explosion. Poor quality oil can lead to engine failure and produce a knocking noise. Additionally, you may notice decreased gas mileage. Use high-grade oil to keep the engine operating efficiently, and remember to change the oil every 5,000 to 10,000 miles to avoid engine problems.
Don't wait until you hit 10,000 miles to change your oil. You'll be setting yourself up for issues. Ignore what anyone else says, just don't delay the oil change.
The oil capacity of the 2018 Subaru WRX STI is 4.5 quarts.