Parts for your 2018 Subaru Impreza-Gas struts

2018 Subaru Impreza gas struts — where they’re used and how to look after them

On the 2018 Subaru Impreza, gas struts are factory-fitted to the rear hatch (liftback) to hold the back door open and control its movement. This is detailed in Subaru’s service manual (Body section: Rear Gate > Rear Gate Stay) and the Subaru genuine parts catalogue, which lists the “Stay Assembly–Back Door” for the GT/GK hatch. The bonnet uses a support rod rather than struts (Service Manual: Engine Hood), and the sedan’s boot lid uses gooseneck hinges with torsion springs, not gas struts (Body: Trunk Lid/Torsion Bar). So, gas struts are relevant for the hatch’s rear gate only.

Those rear hatch gas struts do the heavy lifting, assisting the hatch to rise smoothly and stay put without wobble or slam. They’re nitrogen-charged dampers, sealed to keep dirt out and pressure in, which is why a healthy pair feels smooth and evenly controlled through the whole arc.

As part of regular servicing, it’s worth a quick check every 10,000–15,000 km or six months: open the hatch fully, listen for squeaks or hiss, and feel for weak lift, jerky motion, or the hatch sagging in wind. Any oil misting around the rod seals is a red flag. Don’t lubricate the shiny piston rods—oils attract grit and can damage the seals. Just keep the area clean and free of debris.

If replacement’s needed, do both sides together so the load stays balanced. It’s a straightforward DIY for a keen owner: support the hatch safely (a helper or a prop), then use a small flat screwdriver to pop the retaining clips, swap the strut, and click the clips back home. Always confirm secure seating on the ball studs. If torque specs are required for any fasteners, refer to the Subaru workshop manual for your VIN.

There’s no set expiry, but most owners see 5–10 years out of a pair depending on climate, usage, and how often the car parks tail-up on steep driveways. If the car’s a sedan, don’t chase “boot struts”—they’re not fitted from factory. For bonnet lift, aftermarket kits exist, but they’re not OEM equipment on this model year.

• Signs you’re due: hatch won’t stay up, rises slowly, or drops suddenly
• Best practice: replace in pairs and avoid compressing new struts by hand
• Service tip: quick function test at each service keeps surprises at bay

Popular questions about 2018 Subaru Impreza gas struts

Do all 2018 Imprezas have gas struts?
The hatchback does—on the rear gate. The bonnet uses a prop rod, and the sedan boot uses torsion springs. This layout is confirmed in Subaru’s body and trim procedures and parts listings for the GK/GT platform.

How long do the hatch gas struts typically last?
Anywhere from 5 to 10 years is common. Heat, dust, and frequent use can shorten that. If the hatch won’t hold up, moves in steps, or shows oil at the seal, it’s time to replace the pair.

Can just one strut be replaced?
It’s better to do both. Mixing a new strut with a tired one can twist the hatch, stress hinges, and shorten the life of the new unit. Replacing in pairs keeps lift and damping even.