Parts for your 2018 Subaru Exiga-Exhaust gasket

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

Yes, the 2018 Subaru Exiga (sold in many markets as the Exiga Crossover 7) uses exhaust gaskets. Subaru’s factory service literature (Exhaust section within STIS/Subaru Technical Information System) specifies replacing exhaust gaskets whenever joints are disturbed, and the Subaru FAST electronic parts catalogue lists dedicated “Gasket – Exhaust Manifold” and “Gasket – Front/Center Pipe (donut/crush)” for the 2018 Exiga/Crossover 7 FB-series engine. Those documents confirm the model has gaskets at the cylinder head to manifold, at the front pipe/catalyst flanges, and at rear pipe to muffler joints. So an exhaust gasket is absolutely relevant to this vehicle.

The exhaust gasket’s job is simple but critical: it seals hot exhaust gases so they flow through the catalytic converter and mufflers, not into the engine bay or cabin. At the manifold, a multi-layer steel gasket copes with heat cycles and expansion, at the flanged or spring-bolt joints further back, crush or “donut” gaskets take up movement and keep the system quiet and leak-free. When these gaskets harden, crack, or get squashed unevenly, owners often notice a ticking sound on cold start, a sooty stain around a joint, a whiff of exhaust odour, or even a drop in fuel economy due to skewed O2 sensor readings.

For servicing, there’s no fixed kilometre interval—think condition and disturbance-based replacement. Any time the exhaust is removed (for clutch work, CVT service access, or muffler upgrades), plan on new gaskets and, ideally, new spring bolts where specified. Stick with quality OEM-equivalent gaskets: multi-layer stainless/graphite at the manifold and proper crush rings at donut joints. Refit flanges square, check for warped faces, replace tired studs or nuts, and torque fasteners to the Subaru spec—over-tightening can distort flanges and cause repeat leaks. After a road test, a quick re-check for any ticking or fumes under the bonnet or underbody is wise. For safety and compliance (WOF/COF in NZ and roadworthy in Australia), a leaking gasket can be a fail, and prolonged leaks can heat nearby components and let harmful gases into the cabin. It’s a relatively inexpensive part that protects the engine’s sensors, keeps things quiet, and helps the Exiga pass emissions—well worth doing right the first time.

• Common signs to watch: ticking on start-up, exhaust smell near the front pipe, black soot at a joint, or a louder note.
• Pro tip: if one joint leaks, inspect hangers and mounts—excess movement often causes repeat gasket failures.

FAQs

Does the 2018 Subaru Exiga have exhaust gaskets, and where are they?
Yes. There are gaskets at the cylinder head to exhaust manifold, at the front/centre pipe connections (often a donut/crush style with spring bolts), and at the rear pipe to muffler joints. These seal heat-affected joints and allow some movement without leaks.

How often should exhaust gaskets be replaced on a 2018 Exiga?
There’s no strict interval. Replace whenever a joint is disturbed, or if there are symptoms like ticking, fumes, or soot marks. During routine servicing, a quick inspection of flanges, spring bolts, and hangers helps catch issues early.

Is it safe to drive with a leaking exhaust gasket?
Best avoided. Leaks can let fumes into the cabin, skew oxygen sensor readings, and get noisy. They can also lead to WOF/roadworthy failures. If a leak is suspected, arrange a repair promptly and use quality replacement gaskets.