The typical requirement for most 2009 Impreza models is 5W-30 engine oil, with turbocharged variants such as the WRX generally calling for 5W-40. Exact specifications depend on the engine variant and your climate. Always verify with the owner’s manual or a Subaru technician for your specific build.
The 2009 Impreza lineup includes several engines, and the oil grade can vary between non-turbo and turbocharged models. This article provides a practical guide to help you choose the right oil weight and whether synthetic oil is advisable for your vehicle. When in doubt, consult the manual or a dealer to ensure you’re meeting Subaru’s recommendations for your exact model and driving conditions.
Oil specifications by engine variant
Below is a quick guide to the typical oil grades used by the main 2009 Impreza variants. Use this as a starting point, but confirm with the manual on your exact build.
- 2.5i (non-turbo): Use 5W-30 full synthetic oil (or a synthetic blend if needed). Follow the service intervals in the manual.
- WRX (turbocharged): Use 5W-40 full synthetic oil to help with turbo cooling and protection under higher power output.
- WRX STI: Use 5W-40 full synthetic oil for high-performance turbocharged engine.
Note: This list covers the main engines in the 2009 Impreza lineup. For any non-US markets or specialized trims, oil specs could differ. Always check the owner's manual sticker under the hood if you have any doubt.
Maintenance and practical tips
When selecting oil, choose a high-quality brand that meets Subaru’s specification and API ratings. Use a full-synthetic or synthetic-blend oil, and replace the oil filter with every change. The typical oil change interval for the 2.5i is every 5,000–7,500 miles (about 8,000–12,000 kilometers), depending on driving conditions; turbo models may have shorter intervals. Check your manual for the exact schedule.
Where to confirm the exact spec
If you’re unsure which engine your car has or which oil weight to use, there are several reliable sources to confirm the specification: the owner’s manual, the oil fill cap inside the engine bay, a dealership service department, or Subaru’s official support resources. The manual will specify the recommended viscosity, whether synthetic is required, and the recommended change interval for your climate and driving style.
Summary
The 2009 Subaru Impreza generally calls for 5W-30 engine oil, with turbocharged variants like the WRX and WRX STI typically requiring 5W-40. Always verify the exact specification for your engine and climate in the owner’s manual or with a Subaru dealer to ensure optimal protection and performance.