Parts for your 2016 Subaru Outback-Exhaust gasket

2016 Subaru Outback exhaust gasket — what it does and when to replace it

Yes, the 2016 Subaru Outback uses exhaust gaskets. Referencing technical sources: the Subaru Factory Service Manual (MY2015–2018 Outback, Exhaust section) and the Subaru Genuine Parts Catalogue for the 2016 Outback (FB25 2.5L and EZ36 3.6L) both show multiple exhaust sealing gaskets. These include cylinder head–to–exhaust manifold gaskets, a spring-bolt “donut” gasket between the manifold and front pipe, and flange gaskets around the catalytic converters, centre pipe and rear mufflers.

On this Outback, exhaust gaskets are there to keep hot gases sealed inside the system, control noise, and ensure the oxygen sensors get clean, accurate readings. A tidy seal helps fuel economy, keeps the cabin free of fumes, and protects nearby components from heat and soot.

For servicing, it’s smart to have the exhaust looked over during regular 10,000–15,000 km service intervals. A quick visual check for black soot at joints, a cold-start listen for “ticking” or chuffing sounds, and a whiff for exhaust odour under the bonnet or near the firewall goes a long way. Any joint that’s been undone—say, for a clutch, gearbox or catalytic job—should get a fresh gasket and new spring/locking hardware, as Subaru specifies single-use fasteners in the service literature.

When replacing, stick with OEM-style parts: multi-layer steel (MLS) gaskets at the manifold-to-head, and a graphite/metal crush “donut” at the spring-bolt union. No sealant is required—clean, flat mating faces and the correct torque and tightening sequence are what keep things quiet and tight. If a fastener is corroded, soak it first and support the pipes to avoid stressing flex joints. After installation and a heat cycle, a cold re-check of fasteners to the factory spec can help long-term sealing.

• Typical signs of a leak: ticking at cold start, sharp exhaust note, sulphur/strong exhaust smell, soot around a joint, or fuel trims/DTCs caused by false air upstream of an O2 sensor.
• Typical replacement triggers: leak present, joint disturbed during other repairs, or visible damage/corrosion at a flange.
• Driving that speeds wear: frequent short trips, rough roads, towing, or salt exposure.

Bottom line: the 2016 Outback absolutely runs exhaust gaskets, and keeping them in good nick is cheap insurance for performance, comfort and emissions.

Popular questions

Does a 2016 Subaru Outback have an exhaust gasket?
Yes. The factory service manual and Subaru parts listings show gaskets at the head-to-manifold joints, a spring-bolt donut between the manifold and front pipe, and additional flange gaskets along the system.

How often should the exhaust gaskets be replaced?
They’re not a scheduled replacement item. Replace them if there’s a leak, if a joint has been undone for other work, or if corrosion or damage is spotted. Always use new spring bolts/lock nuts where specified.

What are the signs of a leaking exhaust gasket on a 2016 Outback?
Common clues are a ticking noise on cold start that softens as it warms, a sharper exhaust note, a whiff of exhaust near the engine bay, soot marks around a flange, and sometimes fuel trim faults from air sneaking in ahead of an O2 sensor.