Choosing the right engine oil is essential for the performance and longevity of your 2020 Subaru WRX. This guide provides a detailed look at oil specifications and maintenance tips to ensure your vehicle operates smoothly.
Key Specifications
- Engine Type: Turbocharged 2.0-liter flat-four.
- Oil Capacity: Approximately 5.4 quarts (with oil filter.)
- Recommended Oil Viscosity: 5W-30.
🛢️ Recommended Oil Types
- Mobil Super™ Motor Oil: Key Features
- Type: Synthetic blend motor oil.
- Base Stocks: Formulated from high-quality base stocks.
- Performance Additives: Designed to protect critical engine parts.
- Oil Change Interval: Protects for up to 5,000 miles or OEM recommended interval.
- Warranty Compliance: Meets API certification requirements.
- Suitability: Suitable for the 2020 Subaru WRX.
- Castrol GTX High Mileage Motor Oil: Key Features
- Type: Synthetic blend engine oil.
- Phosphorus Replacement Technology: Reduces phosphorous to protect the emission system.
- Sludge Protection: Superior dispersancy to combat sludge buildup.
- Burn-Off Protection: Protects against oil burn-off exceeding industry standards.
- Seal Conditioners: Helps reduce leaks in high-mileage engines.
- Wear Protection: Advanced additives minimize engine wear.
- Fuel Economy: Improves fuel efficiency.
- Suitability: Suitable for the 2020 Subaru WRX.
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil: Key Features
- Engine Protection: 75% more protection against horsepower loss and wear.
- Cleaning Power: 50% more cleaning capability vs. AMSOIL OE Motor Oil.
- Turbocharger Protection: 72% better protection than GM dexos1 Gen 2 specification.
- Acid Neutralization: 28% more acid-neutralizing power than Mobil 1.
- Professional Endorsement: Trusted by professional engine builders.
- Guaranteed Longevity: Protects for up to 25,000 miles or 1 year.
- Suitability: Suitable for the 2020 Subaru WRX.
For those interested in more in-depth information on rebuilding your Subaru WRX, you can read more HERE.

🔍 Synthetic vs. Conventional Oils: A Straightforward Comparison
🧬 Why Molecular Structure Matters
- Synthetic oils, like AMSOIL, are engineered with a more consistent molecular makeup. Unlike conventional oils, which often have impurities and uneven molecule sizes, synthetic oils deliver smoother and more reliable performance.
🛡️ Better Engine Protection
- Synthetic oils create a tougher, longer-lasting barrier between engine parts. This extra protection helps reduce wear, especially in high-stress situations or extreme temperatures.
❄️ Cold Starts Made Easy
- In colder weather, synthetic oils stay fluid, allowing engines to start quickly and smoothly. This quick lubrication cuts down on wear during those critical first moments after starting your car.
♨️ Handles Heat Like a Pro
- Synthetic oils resist breaking down under high temperatures. This reduces the buildup of sludge and deposits inside your engine, keeping it cleaner and running better for longer.
â›˝ Improves Fuel Efficiency
- The uniform structure of synthetic oils minimizes friction inside the engine. Less friction means better fuel economy, saving money at the pump and reducing emissions.
🌍 Friendlier to the Environment
- Because synthetic oils last longer and reduce emissions, they leave a smaller environmental footprint. They also cut down on waste oil and allow for extended oil change intervals, which means fewer trips to the service shop.
đź“Ś Things to Keep in Mind
Sure, synthetic oils might cost more upfront. But the benefits, like longer intervals between changes, better performance, and improved fuel mileage, can save you money in the long run.
If you’re driving a 2020 Subaru WRX—or any car you care about—choosing the right oil can make all the difference. Synthetic oils are designed to go the distance, protecting your ride every step of the way.

Conclusion
Choosing the right oil type for your 2020 Subaru WRX is crucial for maintaining performance and longevity. Consider synthetic oils for their superior protective properties. Always refer to the manufacturer’s guidelines for the best results in engine care. For more details on high-performance motor oils, explore: Castrol HERE, Mobil HERE, and AMSOIL HERE.