Parts for your 2018 Subaru Impreza-Struts

2018 Subaru Impreza struts — what they do and when to replace them

Based on the Subaru Service Manual (2018 Impreza, Chassis/Front Suspension), Subaru Australia MY18 Impreza specifications, and OEM parts catalogues, the 2018 Subaru Impreza uses MacPherson struts at the front and a double‑wishbone rear with separate shock absorbers. So struts are very much relevant to this model — at the front axle only — while the rear runs conventional shocks.

On a 2018 Subaru Impreza, the front MacPherson strut does two big jobs: it supports the vehicle’s weight and controls suspension travel, and it also locates the wheel to keep steering geometry in check. The strut integrates the damper and coil spring, with a top mount and bearing so the whole assembly can turn smoothly as the steering is moved. Good struts help the Impreza track straight, keep tyres planted in the wet, and rein in body roll, dive, and squat — all the things that make a daily drive feel tidy and safe.

While there’s no fixed replacement age, many owners see the best results refreshing front struts somewhere between 80,000 and 150,000 kilometres, earlier if the car sees rough Kiwi backroads or corrugated Aussie highways. During regular servicing, it’s smart to have the fronts checked for oil seepage down the strut body, torn dust boots or bump stops, cracked or noisy top mounts, and any free play that shows up as a clunk over sharp bumps. Uneven or cupped tyre wear, extra bounce after speed humps, a vague front end, or nose‑diving under brakes are classic tells the dampers are tired.

When replacement time comes, doing both front struts as a pair keeps the car balanced. Many workshops will recommend fresh top mounts/bearings, dust boots, and spring isolators at the same time — small bits that make a big difference to steering feel and longevity. After fitting, a proper four‑wheel alignment is essential, on a MacPherson setup the strut position directly influences camber and toe, so skipping alignment can chew through tyres and make the car wander. It also pays to torque rubber‑bushed components at ride height and recheck fasteners after a short shakedown, once everything has settled.

The rear of the 2018 Impreza uses shocks, not struts, so front strut maintenance is the main focus. Keeping those fronts healthy maintains braking stability, supports ABS/ESC performance, and helps the car sail through a WOF or roadworthy without drama.

• Common signs to watch: clunks, extra bounce, oily strut bodies, cupped tyres, steering that feels “sticky” or notchy.
• Service tips: replace in pairs, add new top mounts, align immediately, and choose quality components matched to any springs.

FAQs

Does the 2018 Subaru Impreza have struts in the rear?
The 2018 Impreza runs MacPherson struts at the front only. The rear is a double‑wishbone design with separate shock absorbers and coil springs, so rear “struts” don’t apply. If you’re shopping parts, look for rear shocks, not rear struts.

How long do front struts last on a 2018 Impreza?
It varies with roads and loads, but many owners find 80,000–150,000 km is the window where freshness drops off. Annual checks for leaks, bounce, and top‑mount noise will catch issues early, and tyre wear patterns are a great early warning.

Do you need a wheel alignment after replacing front struts?
Yes. On a MacPherson‑strut front end, the strut position affects camber and toe. An alignment right after installation protects tyre life, sharpens steering, and keeps the car stable under brakes.