Parts for your 2008 Subaru Forester-Exhaust gasket

2008 Subaru Forester exhaust-gasket: purpose, fitment, and service tips

According to Subaru’s Factory Service Manual for the 2008 Forester (Exhaust section) and the Subaru Electronic Parts Catalogue (Group 44 – Exhaust), exhaust gaskets are absolutely fitted to this model. The listings cover the cylinder head–to–exhaust manifold multi‑layer steel gaskets, the front pipe “donut” gasket with spring bolts, and rear flange gaskets. On turbocharged XT variants, additional gaskets are shown for the turbocharger outlet to downpipe and the up‑pipe connections. So yes—an exhaust gasket is relevant to the 2008 Subaru Forester.

On this Forester, exhaust gaskets do the quiet, grubby work of sealing super‑hot gases as they leave the engine, keeping fumes out of the cabin, noise down, and oxygen sensor readings tidy. Good sealing helps the ECU maintain correct fuel trims and protects nearby components from heat and soot. Naturally aspirated models use head‑to‑manifold gaskets and a spring‑joint donut at the front pipe, while turbo models add a few more critical seals around the turbocharger.

They’re not a time‑based service item, but best practice is to replace any exhaust gasket whenever that joint is disturbed—say, when removing the manifold, swapping a cat‑back, or chasing a rattle. Use quality OEM‑equivalent parts, fit them clean and dry unless Subaru specifically calls for a sealant, and torque fasteners to the Subaru spec from the manual. Replacing self‑locking nuts, studs, and the spring bolts at the donut joint is smart insurance.

• Tell‑tales of a failing gasket: a ticking or chuffing noise on cold start that gets sharper under load, a whiff of exhaust odour near the bonnet or under the car, visible soot at a flange, or an exhaust leak noted at a WOF/RWC check.
• When replacing: let the system cool, support the exhaust so it doesn’t hang on the studs, wire‑brush mating faces, and check heat shields and hanger rubbers while you’re there.

Turbo XT owners should pay special attention to turbo outlet and up‑pipe joints—heat cycling is harsher there, and small leaks can sound like a whistle or ticking. After any exhaust work, a quick recheck for leaks once the system has heat‑cycled is a good move.

1. Have a visual check of flanges and spring joints at regular services (around every 20,000 km).
2. If the exhaust is split for towing gear or suspension work, plan new gaskets on reassembly.

Popular questions

How can they tell if their 2008 Forester’s exhaust gasket has blown?

Common clues are a sharp ticking on cold start that softens as the metal expands, a hissing under load, or soot trails around a flange or the manifold. They might also notice a faint exhaust smell near the front of the car or slightly poorer fuel economy if the leak upsets O2 sensor readings.

A simple check is to briefly block the tailpipe with a rag at idle (don’t hold it long). If a joint is leaking, the note often changes and the tick becomes obvious. A torch and a mirror help to spot soot marks.

Can exhaust gaskets be reused on a Subaru Forester?

It’s not recommended. Multi‑layer steel and donut‑style gaskets crush on first fit, and reusing them risks leaks and warped flanges. Subaru service information treats these as replace‑on‑removal items. Fresh self‑locking nuts and spring hardware are cheap insurance against do‑overs.

If a joint has been apart, fit a new gasket, clean the faces, and torque to spec from the Subaru manual.

Which exhaust gaskets does the 2008 Forester XT (turbo) have compared with the non‑turbo?

Both have head‑to‑manifold and front pipe donut gaskets. The XT adds turbocharger‑specific seals, typically at the turbo outlet to downpipe and the up‑pipe joints. Those extra gaskets live hotter lives and are more prone to noise if they start leaking, so XT owners should be a bit more vigilant.