Parts for your 2018 Subaru Exiga-Manifold gasket

2018 Subaru Exiga manifold gasket — what it does and when to replace it

Based on the Subaru Factory Service Manual for the Exiga/Crossover 7 with FB-series engines and the Subaru Electronic Parts Catalogue, the 2018 Subaru Exiga uses manifold gaskets on both the intake and exhaust sides. These references specify dedicated gaskets between the cylinder heads and the intake manifold, and multi‑layer steel gaskets at the exhaust manifold flanges, so a manifold gasket is absolutely relevant to this model.

On this Exiga, the manifold gaskets seal where the manifolds bolt to the engine. The intake manifold gaskets keep unmetered air out so the engine doesn’t run lean, stumble, or throw fuel-trim faults. The exhaust manifold gaskets keep hot gases in the exhaust stream, protecting nearby components, preserving oxygen sensor readings, and preventing that tell‑tale ticking noise and fumes under the bonnet.

There’s no fixed service interval for manifold gaskets, but they’re considered single‑use parts whenever a manifold is removed. During regular servicing, a technician may inspect for vacuum hiss, idle changes when lightly misting around the intake joints (carefully), exhaust ticking on cold start, sooty marks at the exhaust flanges, or a whiff of exhaust in the cabin at idle — all common clues a gasket has given up.

When replacement’s on the cards, going with genuine or OE‑equivalent gaskets saves grief. The mating surfaces should be clean and flat, with old material fully removed without gouging the alloy head. New bolts or studs are a smart move if the old ones are corroded. Follow the factory torque values and patterns from the Subaru manual — even clamping is key to a long‑lived seal. It’s also a good time to check adjacent items like PCV hoses, throttle body and EGR gaskets, and to ensure oxygen sensor wiring is routed clear of heat.

DIYers with a bit of patience can tackle intake gaskets, exhaust gaskets can be more stubborn thanks to heat‑cycled hardware. If there’s any doubt, an authorised workshop can pressure‑test for intake leaks, confirm the source of an exhaust tick, and refit with the right torque sequence. Catching a minor leak early keeps fuel economy tidy, the engine smooth, and emissions gear happy across Kiwi and Aussie conditions.

• Replace manifold gaskets whenever the manifold is removed.
• Investigate if there’s a cold-start tick, lean codes, rough idle, or exhaust smell.
• Use OE-spec gaskets and follow Subaru torque procedures for best results.

Popular questions about 2018 Subaru Exiga manifold gaskets

Does a 2018 Subaru Exiga have intake and exhaust manifold gaskets?
Yes. Technical documentation (Subaru Factory Service Manual and the Subaru parts catalogue) lists dedicated intake manifold gaskets and multi‑layer steel exhaust manifold gaskets for the 2018 Exiga/Crossover 7. They’re standard sealing components on the FB‑series petrol engine used in this model.

When should the manifold gaskets be replaced?
There’s no time or kilometre schedule. Replace them if there are signs of leakage or any time the manifolds are removed for other work. Typical symptoms include a ticking noise on cold start (exhaust), a vacuum hiss or rough idle (intake), fuel‑trim fault codes, or visible soot at the exhaust flange.

Can the old manifold gaskets be reused?
Not recommended. Subaru service guidance treats them as single‑use. Exhaust gaskets are heat‑crushed, and intake gaskets can lose their sealing compression once disturbed. Given the low cost of new gaskets versus the hassle of redoing the job, fresh parts are the sensible choice.