The 2002 Subaru Impreza oil type and capacity iS5W-30 and 4.8 quarts for the 2.0 L boX4 engine. Having high quality oil is key for the engine to run smoothly. You will run into issues with the oil at some point. A common problem is an awful burning odor. This needs to be viewed closely as soon as possible or the car might explode. Bad oil can cause the engine to fail. Knocking noise may show up from the engine. You could experience poor gas mileage. Your oil needs to be changed out someday. Every 5,000 to 10,000 miles or so is a good rule of thumb. If You don't replace it, there will be problems with the engine.
John A.
January 2, 2020
The 2002 Subaru Impreza 2.0L box-4 base engine uses 4.8 quarts synthetic oil and the 2.5L box-4 optional engine uses 4.2 quarts of synthetic oil. The viscosities are all the same, which are listed here: 5W30 (below 104 F) 10W30/10W40 (above -4 F) and 30 weight, 40 weight, 10W50, 20W40, or 20W50 (above 95 F or heavy duty operation).
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