Parts for your 2016 Subaru Legacy-Exhaust gasket

2016 Subaru Legacy (Liberty) exhaust-gasket — purpose, servicing and replacement tips

Based on Subaru’s own technical literature, the 2016 Subaru Legacy (known as Liberty in Australia and New Zealand) absolutely uses exhaust gaskets. The Subaru Service Manual for 2015–2019 Legacy/Outback (Exhaust section, STIS) specifies gasket replacement whenever exhaust joints are disturbed, and the Subaru FAST global electronic parts catalogue lists multiple exhaust gaskets for the BN/BS platform, including cylinder-head to manifold gaskets, manifold/front pipe “donut” ring gaskets, and flange gaskets further downstream. So yes, an exhaust-gasket is relevant and fitted on this model.

This car relies on a small family of gaskets to keep the exhaust sealed under heat, movement and vibration. At the engine, multi-layer steel gaskets sit between the cylinder head and manifold to keep combustion gases from escaping. A crush-style “donut” gasket handles the joint between the manifold or front pipe and the rest of the system, allowing a bit of flex without leaks. Further back, flat flange gaskets tidy up the join between centre and rear sections. On the 2.5i FB25 and the 3.6R EZ36 alike, these gaskets are essential for quiet running, correct oxygen sensor readings and keeping fumes out of the cabin.

For servicing a 2016 Subaru Legacy exhaust-gasket setup, the advice is simple and straight from the manual: if a joint is unbolted, plan on new gaskets when refitting. They’re designed to crush once and seal, reusing them can lead to ticks, hissing, exhaust odour, soot at the flange and even a check engine light from skewed O2 sensor data. During routine services, it’s worth a quick visual under the car for black soot marks at flanges, a sharp ticking on cold start, or a whiff of exhaust near the firewall — all early clues a gasket is done. In coastal Aussie and Kiwi conditions, also keep an eye on hardware corrosion, studs and spring bolts at the front pipe are common trouble spots.

When replacing, clean the mating faces, use the correct orientation (many Subaru gaskets are directional), and torque the fasteners evenly to spec with the car cool. Quality OEM-equivalent gaskets are inexpensive insurance against droning, fumes and failed inspections, keeping the Legacy/Liberty running sweet and legal on local roads.

• Replace exhaust gaskets whenever a joint is separated
• Check for ticking, soot, or exhaust smell as early warning signs
• Use correct torque and fresh hardware where required

Popular questions about the 2016 Subaru Legacy exhaust-gasket

What are the signs of a leaking exhaust gasket on a 2016 Legacy/Liberty?
A sharp ticking on cold start that softens as it warms, a light hiss under throttle, or a faint exhaust odour near the engine bay are typical. You might also spot black soot around a flange or joint. In some cases, the ECU logs fuel trim or O2 sensor codes because unmetered air upsets readings.

How often should exhaust gaskets be replaced?
There’s no fixed interval, they’re replaced on condition or whenever a joint is disturbed for other work (for example, replacing a catalytic converter, O2 sensor, clutch on manuals, or removing the front pipe). If the car lives near the coast or sees lots of short trips, inspect more frequently for corrosion and leaks.

Is it safe to keep driving with a blown exhaust gasket?
Short answer: not ideal. Small leaks can let fumes creep toward the cabin and can skew sensor data, hurting fuel economy and potentially damaging the catalytic converter over time. It’s usually an easy, affordable fix — best sorted before it snowballs.