Parts for your 2008 Subaru Forester-Manifold gasket

2008 Subaru Forester manifold gasket — what it does and when to replace it

Per the Subaru Factory Service Manual for the 2008 Forester (EJ25 2.5‑litre, including XT), the engine uses manifold gaskets at the intake manifold-to-cylinder head and exhaust manifold-to-cylinder head joints. Subaru’s own service literature and major gasket catalogues for EJ25 applications specify multi‑layer steel (MLS) or equivalent composite manifold gaskets, so a manifold gasket absolutely is fitted and relevant on this model.

On this Forester, the manifold gaskets seal high‑vacuum intake runners and high‑temperature exhaust ports. Their job is simple but critical: keep unmetered air out of the intake, keep exhaust gases in the headers, prevent loss of performance, and stop heat, soot, and noise from escaping. Proper sealing also protects nearby components (like plastic loom clips and O2 sensor wiring) from hot gas leaks.

Owners will usually notice a crook manifold gasket through one or more of these signs:

• Ticking or chuffing noise on cold start that gets quieter as it warms (often exhaust leak)
• Rough idle, lean codes, or high fuel trims (intake leak)
• Soot trails around the exhaust flange or a whiff of fumes in the bay
• Lower power, poor fuel economy, or a whistle under load

Servicing advice for the 2008 Forester’s manifold gaskets is straightforward. They’re not a scheduled replacement item, but any time the intake manifold or exhaust manifold is removed—say for spark plugs on the turbo, valve cover work, or header swaps—fresh gaskets should be fitted. The Subaru FSM calls for proper bolt/nut torque and sequence