What is the best oil to run in a Subaru?
The best oil for most Subaru engines is a fully synthetic 0W-20. This viscosity is the default recommendation for many modern Subarus, delivering strong cold-start protection and fuel efficiency. However, some older or turbocharged variants, as well as specific climate conditions, may require a different viscosity. Always consult your owner's manual for the exact specification.
Subaru’s engineers design their boxer engines to operate with a specific oil profile. This article outlines practical guidance for typical owners, from Impreza to Outback, WRX, and Forester, and explains where exceptions may apply.
Common oil viscosities for Subaru engines
There are a few viscosity options you’ll encounter in Subaru owner guides. Here’s a quick overview of when each is typically used.
Engine-specific caveats
Some engines or climates may call for a different viscosity than 0W-20. Always verify with your manual or dealer, especially for turbocharged models or older EZ-series engines.
- 0W-20 synthetic: The default and most widely recommended choice for most current Subaru engines (including many FA and FB-series engines). It offers excellent cold-start protection and efficiency.
- 5W-30 synthetic: A suitable alternative for older engines, higher-mileage vehicles, or warmer climates where a slightly thicker oil helps maintain film strength. Verify in the owner's manual.
- 5W-40 synthetic: Rarely required, but some turbocharged or high-performance variants and extreme climate applications may specify it. Check your manual or with a Subaru representative for your exact model.
Conclusion: For the vast majority of drivers, 0W-20 synthetic is the safest and most economical choice, with 5W-30 or 5W-40 reserved for specific engine types and conditions as directed by the manual.
Choosing the right oil: brands and standards
Oil quality standards and Subaru’s own specifications matter. The following guidelines help you select oil that protects the engine while keeping warranty considerations in mind.
Standards to look for
- Fully synthetic oil that meets current industry standards (typically ILSAC GF-6 or newer and API SN or newer). This ensures good oxidation stability and protection across temperature ranges.
- Oil labeled with the appropriate viscosity for your model (for example, 0W-20) and labeled as synthetic rather than conventional.
- Brands with a proven track record and availability in your region. Popular options include Mobil 1, Castrol EDGE, Pennzoil Platinum, Valvoline Advanced, and similar synthetic lines that offer 0W-20 in most markets.
Conclusion: Use a reputable fully synthetic oil that matches the viscosity your Subaru manual calls for and meets current standards. This supports engine protection, efficiency, and long-term reliability.
Maintenance tips and intervals
Oil-change intervals depend on model year, driving conditions, and oil type. Here are practical guidelines to help you stay on track with a Subaru.
How to time and manage changes
- Consult the owner's manual or dealer for the official interval. With modern synthetic oils, many Subarus fall in the 7,500–10,000-mile range under normal conditions, but severe driving can shorten this.
- Use Subaru’s maintenance minder reminders (if equipped) and adhere to the recommended service schedule.
- Follow proper oil-change procedures: run the engine to warm, turn off, level surface, and read the dipstick to confirm an adequate level before driving again.
Conclusion: Regular oil changes with the correct viscosity and quality oil are essential to keep a Subaru’s flat-four boxer engine running smoothly and efficiently.
Summary
In most cases, the best oil for a Subaru is a fully synthetic 0W-20 that meets current standards and matches the vehicle’s manual. If your model or climate requires a different viscosity, such as 5W-30 or 5W-40, follow the manual’s guidance. Choose a reputable brand and ensure the oil label specifies the correct viscosity and synthetic formulation. Adhering to the recommended interval and using the right oil composition are key to maximizing engine life and performance.
