The 2018 Subaru Outback is one of Subaru’s most versatile and dependable crossover wagons, offering excellent all-weather capability, impressive cargo space, and long-term reliability. Whether your Outback is equipped with the fuel-efficient 2.5L BOXER® 4-cylinder engine or the powerful 3.6L BOXER® 6-cylinder engine, using the correct engine oil is essential for maximizing performance and engine life.
Engine oil lubricates internal components, reduces friction, controls engine temperatures, and helps prevent sludge buildup. Choosing the correct oil viscosity and following Subaru’s maintenance schedule can help your Outback easily exceed 200,000 miles while maintaining reliability and fuel economy.
What Oil Does a 2018 Subaru Outback Take?
The recommended 2018 Subaru Outback oil type depends on the engine installed in your vehicle.
Subaru specifies 0W-20 synthetic oil for the 2.5L engine to improve fuel economy and cold-start protection, while the larger 3.6L six-cylinder engine uses 5W-30 oil for proper lubrication and wear protection.
Best Overall Choice: High-quality full synthetic oil is recommended for both 2.5L and 3.6L Outback engines to maximize protection and performance.
2018 Subaru Outback Oil Capacity
Oil capacity differs significantly between the two available engines. Always replace the oil filter during service and verify the final oil level after refilling.
Best Oil Brands for a 2018 Subaru Outback
Choosing a premium synthetic oil helps reduce engine wear and improves protection during extreme temperatures and long highway drives.
Recommended Oil Brands
- Mobil 1 Advanced Fuel Economy
- Pennzoil Platinum Full Synthetic
- Castrol EDGE Full Synthetic
- Valvoline Advanced Full Synthetic
- AMSOIL Signature Series
- Subaru Genuine Synthetic Oil
Benefits of Synthetic Oil
- Superior engine protection
- Improved cold-weather starts
- Reduced internal friction
- Cleaner engine internals
- Longer oil life
- Better fuel economy
2018 Subaru Outback Oil Change Interval
Subaru generally recommends changing the engine oil approximately every 6,000 miles or 6 months under normal driving conditions, although many owners using premium synthetic oils extend service intervals based on driving habits and maintenance schedules.
2018 Subaru Outback Oil Change Cost
2018 Subaru Outback Engine Specifications
Common 2018 Subaru Outback Oil-Related Problems
Oil Consumption
Some owners report gradual oil consumption between oil changes, making regular dipstick checks important. Community discussions frequently mention monitoring oil levels every few thousand miles.
Low Oil Warning Light
Low oil levels can trigger dashboard warnings, particularly on higher-mileage vehicles that consume oil between service intervals.
Oil Filter Housing Leaks
Aging seals and gaskets can eventually allow minor oil seepage around the filter area.
Incorrect Oil Viscosity
Using the wrong oil grade can increase oil consumption and reduce engine protection. Some owners report improved results when using the factory-specified viscosity.
Signs Your Outback Needs an Oil Change
- Dark or dirty engine oil
- Oil warning light appears
- Increased engine noise
- Reduced fuel economy
- Burning oil smell
- Rough engine operation
- Visible oil consumption
- Sluggish acceleration
Maintenance Tips for Longer Engine Life
- Use the correct Subaru-recommended oil viscosity
- Replace the oil filter at every service
- Check oil levels monthly
- Inspect for leaks regularly
- Maintain proper tire pressure
- Follow Subaru’s maintenance schedule
- Replace engine air filters as recommended
- Address warning lights immediately
Frequently Asked Questions
What oil does a 2018 Subaru Outback use?
The 2.5L engine uses 0W-20 synthetic oil, while the 3.6L engine uses 5W-30 oil. Always verify your engine before purchasing oil.
How much oil does a 2018 Subaru Outback take?
The 2.5L engine holds approximately 5.1 quarts, while the 3.6L engine holds approximately 6.9 quarts with a filter change.
Can I use synthetic oil in my Subaru Outback?
Yes. Full synthetic oil is recommended and provides excellent engine protection and performance.
How often should oil be changed?
Most owners should change the oil every 6,000 miles or six months, depending on driving conditions.
How much does a 2018 Subaru Outback oil change cost?
Oil changes typically cost between $60 and $160 depending on whether the service is performed at home, an independent shop, or a Subaru dealership.
Final Thoughts
The 2018 Subaru Outback is known for durability and long-term reliability when properly maintained. Using the correct oil type, replacing filters regularly, and following recommended oil change intervals will help protect the engine and maximize vehicle lifespan.
For most owners, the best maintenance strategy is using premium synthetic oil, monitoring oil levels between services, and addressing any signs of oil consumption early.
Quick Summary
- 2.5L Oil Type: SAE 0W-20 Synthetic
- 3.6L Oil Type: SAE 5W-30
- Oil Capacity: 5.1–6.9 Quarts
- Oil Change Interval: Every 6,000 Miles
- Oil Change Cost: $60–$160
- Best Oil Choice: Full Synthetic