Parts for your 2015 Subaru Outback-Gas struts

2015 Subaru Outback gas struts — what they do and when to replace them

Yes, gas struts are used on the 2015 Subaru Outback. Technical sources that document this include the Subaru Factory Service Manual for the BS/BN platform (Body section – Rear Gate), the Subaru FAST electronic parts catalogue (MY2015 Outback, Group 63 Rear Gate, listing a gas‑charged “rear gate stay”), and workshop handbooks such as the Haynes Legacy/Outback 2010–2019 manual, all of which show gas‑charged struts supporting the tailgate. Note the bonnet on this model uses a manual prop rod from factory, gas struts there are aftermarket only.

On the Outback, the rear tailgate struts are gas‑charged “springs” that counterbalance the weight of the gate so it lifts smoothly and stays put. Even models with a power rear gate rely on a matched pair of gas struts to share the load with the electric drive, keeping everything quiet, controlled and safe. When they’re healthy, opening the tailgate feels light, and it won’t drift down on a windy day at the beach or during a Bunnings run.

There’s no set replacement interval — they’re wear items that fade over time as the internal nitrogen charge slowly drops. Heat, cold, dust and frequent use all add up. Common signs it’s time to swap them out include:

• The tailgate sags or won’t stay up, especially in cold weather
• Slow, jerky or uneven lift, or the gate “popping” at the top
• Oily film on the shaft or body of the strut
• Clicks, binding or visible corrosion on the rod

Replacement is a straightforward service job: support the tailgate safely, pop off the retaining clips, and change both struts as a pair so lift and damping remain balanced. For power rear gate models, follow the factory initialisation routine after refit so the control unit relearns its limits. It’s worth using quality OE‑equivalent parts so the opening height and closing effort feel right.

Maintenance is light but worthwhile. Keep the chrome shafts clean — wipe with a dry, lint‑free cloth, don’t spray silicone or oil onto them, as residue attracts grit and can damage the seals. Check the ball studs and brackets for play or rust, and make sure trim around the hinges isn’t fouling the struts. If the vehicle regularly carries roof loads, be mindful that opening angles and loads change — tired struts will show up quicker.

Look after the gas struts and the Outback’s tailgate will keep operating smoothly for years, whether it’s hauling camping gear, prams or the weekly shop.

How long do tailgate gas struts last on a 2015 Outback?

There’s wide variation, but many owners see 5–10 years depending on climate and usage. Cold winters and frequent opening shorten life. If the gate won’t stay up or lifts sluggishly, plan a replacement.

Can gas struts be re‑gassed, or should they just be replaced?

On automotive tailgate struts, the practical solution is replacement. While re‑gassing exists in some industries, sealed automotive units aren’t designed for it, and results can be inconsistent. New matched pairs are the reliable fix.

Do power rear gate Outbacks use different struts?

They still use gas‑charged struts, but the rating is matched to the power mechanism. Always order by VIN or spec to ensure the correct force and hardware. After fitting, run the power gate initialisation so it learns its travel.