Can I put conventional oil in my Subaru?
Not usually. Most modern Subarus require synthetic oil (commonly 0W-20) for proper protection and performance. Conventional oil is generally not recommended for routine maintenance. Always check your specific model and year in the owner's manual before making a change.
How Subaru specifies oil requirements
Subaru’s manuals lay out the exact oil grade and viscosity you should use. In the United States, many recent Subarus specify a 0W-20 synthetic oil as the standard. Some older models or models sold in other regions may list different viscosities or allow alternative options, but the trend in recent years has been toward synthetic 0W-20 for efficiency and emissions reasons. Engines with turbochargers or higher performance variants often have their own specific requirements, so it is important to confirm from the manual or your dealer.
Turbo engines and regional differences
Turbocharged Subarus (for example, WRX or STI variants) typically require a synthetic oil with a specification detailed in the owner's manual. Regional markets outside the U.S. may specify different viscosities or oil types as well. Always rely on the exact spec listed for your vehicle’s year and market.
What changes by model year
Oil recommendations have evolved as Subaru updated engines and emission standards. While 0W-20 synthetic is common in newer models, some older i and non-U.S. models might call for other grades. The safest practice is to follow the manual for your exact car.
Common oil specifications you’ll encounter in Subaru manuals:
- 0W-20 synthetic oil is the standard recommendation for many modern Subaru engines in the U.S.
- Some older models or non-U.S. markets may specify 5W-30 (often synthetic) or another grade; verify the exact spec for your car.
- Engines with turbochargers or performance variants have specific synthetic oil requirements listed by year/model.
Bottom line: Always confirm the exact oil grade and type in your owner’s manual or with a Subaru dealer. Using the wrong oil can affect engine protection, performance, fuel economy, and warranty coverage.
Emergency considerations: using conventional oil temporarily
If you find yourself without the recommended oil, keep in mind that conventional oil is not a substitute for routine maintenance. It should not be used as a long-term solution. If you must drive to reach a service center, do so gently, monitor your oil level closely, and plan to replace the oil with the correct synthetic grade as soon as possible.
Emergency steps to take if you’re temporarily without the recommended oil:
- Check your owner's manual to confirm the exact oil specification for your vehicle.
- Plan a service stop as soon as you can to revert to the proper oil and replace the filter.
- Avoid aggressive driving or long trips until you’ve switched to the correct oil.
- Do not mix conventional oil with synthetic oil in the same fill.
Concluding: Conventional oil should not be the norm for a Subaru. Use the recommended synthetic oil at the specified viscosity and change intervals to protect the engine and maintain warranty coverage.
What to do next
Take these practical steps to ensure you’re using the right oil for your Subaru:
- Locate your exact model year and market in the owner’s manual to confirm the oil grade and viscosity.
- If in doubt, contact a Subaru dealer or an ASE-certified technician for the correct specification.
- When possible, purchase the recommended synthetic oil (often 0W-20) and replace the oil and filter at the recommended interval.
- Keep receipts and notes of your oil type and service dates for warranty and maintenance records.
Concluding: Following the manual and using the specified synthetic oil protects your engine, maintains performance, and helps preserve warranty coverage.
Summary
Most Subarus built in the last decade require synthetic oil, typically 0W-20, with some exceptions by engine, year, or market. Conventional oil is not recommended for routine maintenance and may affect warranty and protection. Always verify the exact specification for your vehicle in the owner’s manual or with a Subaru dealership, and revert to the recommended oil at the next service interval. If you’re ever unsure, consult a qualified technician for guidance.
