Parts for your 2017 Subaru Legacy-Engine mount

2017 Subaru Legacy engine-mount: what it is and when to replace it

Based on Subaru’s factory technical information, the 2017 Subaru Legacy (BN/BS series) definitely uses engine mounts. The Subaru Legacy/Outback 2015–2019 Service Manual (Engine > Engine Mounting/Installation) and the Subaru global parts catalogue (FAST) list left- and right-hand “engine mounting insulators” for the FB25 2.5L and EZ36 3.6R engines, with the engine secured to the front crossmember via these mounts, plus a separate transmission mount and a pitch-stop mount. So an engine-mount is absolutely relevant to the 2017 Subaru Legacy.

On this model, the engine mounts are the soft-but-strong cushions that hold the flat-four (or flat-six) in place while soaking up vibration and movement. Subaru uses compliant, often fluid-filled insulators to keep the horizontally opposed engine smooth under the bonnet, so the cabin feels calm at idle, gear changes are tidy, and there’s no harsh thump on take-off or when lifting off. They also help protect exhaust joints, hoses and wiring from being shaken to bits over time.

There’s no fixed replacement interval in Subaru’s schedule, but mounts are a wear item—heat, oil contamination, and stop–start traffic all take a toll. Typical signs of tired mounts on a 2017 Legacy include:

• More buzz through the steering wheel or seats at idle
• Clunks or a lurch when shifting from Park to Drive/Reverse
• Excessive engine rock when blipping the throttle under the bonnet
• Shudder on take-off or with the A/C engaged

Inspection during regular servicing (every 12 months or 15,000 km is a good habit locally) is smart. A tech will look for collapsed rubbers, split housings, or leaked fluid from hydraulic mounts, and check the pitch-stop and transmission mount at the same time.

When replacement is due, going for quality OEM or a trusted aftermarket equivalent keeps NVH close to factory. It’s good practice to replace engine-side mounts as a pair to keep balance side-to-side. Fitment tips a workshop will follow include supporting the engine properly (don’t jack directly on the sump), loosening and aligning all related fasteners before final torque, and tightening to factory specs with the engine at normal ride height. After install, a quick road test for driveline shunt and a visual re-check for proper seating pays off.

Driving mainly in hot Aussie summers, towing, or lots of urban stop–go? Expect mounts to age faster. Catching them early keeps the Legacy feeling tight, quiet and refined—just how Subaru intended.

Popular questions about 2017 Subaru Legacy engine-mounts

How long do engine mounts last on a 2017 Subaru Legacy?
In local conditions, many last 120,000–200,000 km, but heat, oil leaks, and constant stop–start can shorten that. There’s no set interval—go by symptoms and visual checks during routine servicing.

Hydraulic-style mounts can seep or collapse without obvious external damage, so if vibration creeps in at idle or you get a driveline thump on take-off, it’s time for a closer look.

Can worn engine mounts damage other parts?
Yes. Excess engine movement can stress the exhaust flex, CVT/gearbox mount, hoses, and even the pitch-stop mount. It can also create extra NVH that feels like a misfire or rough idle, leading to misdiagnosis.

Sorting the mounts early helps protect surrounding components and restores that smooth Subaru feel.

Should the engine mounts be replaced in pairs?
Generally, yes for the left/right engine insulators. Replacing both keeps balance and ride quality consistent. If one has failed due to age, the other is usually not far behind.

The pitch-stop and transmission mount should be inspected at the same time and replaced if worn to prevent new mounts from being overloaded.