Parts for your 1998 Subaru Forester-Exhaust gasket

1998 Subaru Forester exhaust gasket: what it does and when to replace it

Yes, the 1998 Subaru Forester uses exhaust gaskets. Subaru’s SF-series Forester service manual specifies gaskets at the exhaust manifold-to-cylinder head, and a spring-bolt “donut” gasket where the manifold/front pipe joins, with additional flange gaskets further down the system. This is backed by the Subaru electronic parts catalogue (EPC/FAST) and mainstream gasket catalogues listing Forester SF applications for manifold and pipe-joint gaskets. So the exhaust gasket is absolutely relevant to this model.

On a ’98 Forester, these gaskets seal hot exhaust gases as they leave the engine and travel through the system. They prevent that tell-tale tick on cold start, stop fumes sneaking into the cabin, and help the oxygen sensors read cleanly so fuel economy stays on point. The manifold gaskets are typically multi-layer steel, while the front-pipe joint uses a compressible donut. Both are designed to cope with heat cycles and vibration from Subaru’s boxer engine layout.

As part of routine servicing or any exhaust work, it’s smart to plan on new gaskets whenever a joint is disturbed. Reusing old ones is a bit like reusing a crush washer—can work in a pinch, but it’s a gamble. Common signs it’s time to swap them include a ticking noise that quietens as the car warms up, sooty marks around a flange, whiffs of exhaust under the bonnet or near the floorpan, and a slight loss of torque or poorer fuel economy.

• Use quality OEM or reputable aftermarket gaskets (metal/graphite for flanges, the correct donut for the front joint).
• Inspect studs and spring bolts, replace any that are corroded or stretched so the gasket can seat properly.
• Fit to clean, flat mating surfaces, don’t slather sealant on the donut joint—Subaru designed it to seal dry.
• Tighten on a cold engine and follow the service manual torque and sequence, a quick check after a heat cycle can help if accessible.

If the Forester’s exhaust is being dropped for a clutch, O2 sensor, or muffler job, line up new gaskets in advance. They’re inexpensive, save headaches, and keep the flat-four sounding crisp without annoying leaks that’ll have the neighbours raising eyebrows.

Popular questions

What exhaust gaskets does a 1998 Subaru Forester have and where are they?
It typically has two manifold-to-head gaskets (one per cylinder bank), a donut gasket at the manifold/front pipe joint with spring bolts, and one or more flat flange gaskets further back (cat pipe and rear/muffler flange), depending on the exact market spec. If a joint is opened, replace its gasket.

How can someone tell an exhaust gasket is leaking on a ’98 Forester?
Listen for a ticking sound on cold start that fades as it warms up, look for black sooty tracks around flanges, and watch for a slight exhaust smell near the engine bay or underbody. A minor stumble in fuel economy or a faint hiss under load can also point to a leak before the cat.

Can exhaust gaskets be reused on this model?
It’s not recommended. Once crushed and heat-cycled, gasket materials don’t reliably reseal. The donut relies on correct spring tension and fresh compressibility, and manifold gaskets need a clean, even crush. New gaskets are cheap insurance against leaks and comeback work.