Parts for your 2015 Subaru Forester-Manifold gasket

2015 Subaru Forester manifold-gasket

Yes, a manifold gasket is absolutely used on the 2015 Subaru Forester. Subaru’s factory service information (Subaru Technical Information System/Global Service Manual) and the Subaru OEM parts catalogue specify both intake manifold gaskets and exhaust manifold gaskets for the 2015 Forester across the common FB25 2.5‑litre petrol and the FA20F 2.0‑litre turbo engines. Those sources outline the gasket locations, materials and replacement procedures, confirming the part is relevant on this model.

On this Forester, the manifold gaskets do two critical jobs. Intake manifold gaskets seal the junction between the intake runners and the cylinder heads so only metered air enters the engine, keeping fuel trims happy and idle smooth. Exhaust manifold gaskets seal hot gases at the head-to-manifold flange, preventing ticks, fumes and lost performance. On turbo FA20F models, a tight exhaust seal also helps the turbo spool properly. These gaskets cop constant heat cycling and vibration, so quality and correct fitment matter.

There’s no scheduled replacement interval in Subaru service literature, they’re a fit‑and‑forget item until disturbed or leaking. Smart servicing on a 2015 Forester means inspecting for tell‑tales: a sharp exhaust “tick” on cold start, a whiff of exhaust under the bonnet, or black sooty tracks around the exhaust flange, for intake, listen for a hiss, watch for rough idle, lean codes (like P0171) or higher long‑term fuel trims. Any time the intake or exhaust manifold comes off—say for plugs, injector work, or a turbo job—new gaskets should go in. Reusing crushed gaskets is false economy.

When replacing, stick with OEM or high‑grade equivalents designed for the FB/FA engines (often multi‑layer steel or graphite-composite). Clean the mating faces carefully, avoid sealant unless the service manual explicitly calls for it, and torque the manifold fasteners in the specified criss‑cross sequence. Don’t “give it a nip” later—re‑torquing after heat cycles isn’t recommended unless Subaru specifies it. If fasteners are corroded or studs come out with the nuts, replace them so the clamping load is even. In Aussie and Kiwi conditions—plenty of short trips, coastal air and heat—these checks during regular servicing can save a lot of whinging later.

• Common symptoms of a failing intake gasket: hissing, rough idle, lean code, poor fuel economy.
• Common symptoms of a failing exhaust gasket: ticking on cold start, fumes under bonnet, soot marks, loss of punch.

Popular questions

Does the 2015 Subaru Forester have both intake and exhaust manifold gaskets?
Yes. Factory service manuals and the OEM parts catalogue list intake manifold gaskets and exhaust manifold gaskets for both the FB25 (2.5L) and FA20F (2.0L turbo) engines used in 2015 models. Each gasket type serves a different sealing job and both are essential to proper running.

How often should manifold gaskets be replaced on a 2015 Forester?
There’s no fixed kilometre interval. Replace them if there are leak symptoms or whenever a manifold is removed. Using new quality gaskets during related jobs prevents repeat labour and avoids vacuum or exhaust leaks that can trigger fault codes or noise.

What are the signs of a leaking manifold gasket on a 2015 Forester?
For intake: a hissing sound, rough idle, hesitation and lean mixture codes. For exhaust: a ticking noise on cold start that softens when warm, exhaust smell in the engine bay and visible soot around the flange. Any of these warrant inspection and likely gasket replacement.