5 quarts Oil Filter Part Number SH04102S2 (OEM equivalent) Drain Plug Torque 18–22 lb-ft Recommended Oil Weight 5W-30 (0W-20 is also acceptable on newer models) The Role of the Oil Filter and Drain Plug The oil filter on your Impreza traps metal shavings, dirt, and carbon deposits that naturally occur during engine operation. This guide breaks down the specific requirements for your Subaru boxer engine, from the correct oil weight to the benefits of synthetic blends.
Subaru Impreza Oil Change API SP SN: Ensuring Optimal Performance and Protection
Component Specification Oil Capacity (Typical) 4. Step-by-Step Replacement Procedure While a professional shop is recommended, the process itself is straightforward for the Impreza due to its accessible layout.
Use a high-quality OEM-style or aftermarket filter that meets Subaru specifications to ensure proper filtration. Because the cylinders lie flat, oil can settle in the lower cylinders when the vehicle is off, making the first few seconds after a cold start critical for lubrication.
Subaru Impreza Oil Change with API SP SN Specifications
Always verify this specification on the oil filler cap or in the manual, as turbocharged variants or specific years may have different requirements. Why Oil Changes Matter Specifically for the Subaru Boxer Engine The horizontally-opposed "boxer" design of the Subaru engine means that oil cycles differently than in a traditional inline engine.
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