Parts for your 2004 Subaru Forester-Head gasket

2004 Subaru Forester head gasket — what it does and how to look after it

Yes, a head gasket is absolutely used on the 2004 Subaru Forester. Technical references including the 2004 Subaru Forester Service Manual (Engine, EJ25 series), and Subaru Technical Service Bulletin 09-36-03 regarding cooling system conditioner, confirm the EJ25’s horizontally opposed (boxer) engine employs a cylinder head gasket on each bank to seal combustion, oil and coolant passages. Industry guides such as ALLDATA/Mitchell and Haynes also document Forester head-gasket service procedures for this model year.

On a 2004 Forester, the head gasket sits between the aluminium cylinder head and the engine block, and there’s one per side. Its job is simple but critical: keep high-pressure combustion in, and keep coolant and oil in their own lanes. Because the EJ25 runs alloy heads and sees big temperature swings, the gasket cops a hard life. Early-2000s composite gaskets were known to seep externally