Parts for your 2004 Subaru Impreza-Oil pump

2004 Subaru Impreza Oil Pump — Purpose and Servicing Advice

Technical sources confirm the 2004 Subaru Impreza is fitted with an engine oil pump and relies on it for proper lubrication. References: Subaru Factory Service Manual (2004MY Impreza, Engine: Lubrication section – Oil Pump procedures)