Parts for your 2016 Subaru Legacy-Manifold gasket

2016 Subaru Legacy manifold-gasket: what it does and when to replace it

Technical sources including the Subaru Factory Service Manual for 2015–2019 Legacy/Outback (intake and exhaust manifold sections), Subaru’s FAST electronic parts catalogue, and common aftermarket catalogues (Fel‑Pro, Mahle, Victor Reinz) all list intake and exhaust manifold gaskets for the 2016 Subaru Legacy (sold as Liberty in Australia and New Zealand). That confirms the manifold-gasket is absolutely fitted and relevant on both the 2.5i FB25 and 3.6R EZ36 engines.

On this model, the manifold-gasket seals critical joins: intake manifold to cylinder heads (keeping unmetered air out), and exhaust manifold to heads (keeping hot gases in until the catalytic converters do their thing). When the gaskets are healthy, the engine breathes properly, idles smoothly, and fuel economy stays on song. When they’re tired, owners might notice a ticking exhaust leak on cold start, a fluttering whistle, rough idle, pinging, or fault codes for lean running. There can be a whiff of exhaust under the bonnet or a faint soot line near a flange if the exhaust side is leaking.

They’re not a scheduled replacement item, but they’re consumables. Best practice is to replace the intake manifold gaskets any time the manifold is removed (for example, when doing injector, PCV or top-end work). Exhaust manifold gaskets should be renewed if the headers are off, after an overheating event, or when any leak is suspected.

• Use quality OEM or reputable aftermarket gaskets, avoid generic “one-size” paper types.
• Clean mating faces carefully—no gouging—and never stack old and new gaskets.
• Don’t smear sealant unless the service manual specifically calls for it.
• Torque fasteners in the factory sequence with a calibrated torque wrench.
• On reassembly, inspect adjacent items: throttle body gasket, PCV hoses, intake boots, and exhaust studs/nuts.

Owners commonly plan this around bigger jobs to save labour—pairing intake gasket replacement with spark plugs on higher‑km cars, or valve cover work. As a rule of thumb, a proactive set of intake manifold gaskets at 150,000–200,000 km helps ward off vacuum leaks. For the exhaust side, any time there’s a cold-start tick or a sulphury smell under the bonnet, it’s worth booking in. After refit, a quick scan for trims and a spray test around the intake with brake cleaner (engine idling) helps confirm there are no sneaky leaks.

Popular questions

Does a 2016 Subaru Legacy have manifold gaskets?
Yes. Both engines used in 2016—FB25 2.5i and EZ36 3.6R—use intake manifold gaskets and exhaust manifold gaskets. This is documented in the Subaru service manual and parts catalogues for that model year.

How long do the manifold gaskets last?
They often last well past 150,000 km, but heat cycles, age, and previous disassembly can shorten their life. Replace them whenever the manifolds are removed, or sooner if there are symptoms like exhaust ticking, rough idle, or lean codes.

Can manifold gaskets be reused?
Reusing them is not recommended. Compressed gaskets seldom reseal reliably. New gaskets are inexpensive insurance against leaks and repeat labour.