Parts for your 2009 Subaru Forester-Gas struts

2009 Subaru Forester gas struts: what they do, and when to replace them

Technical sources confirm the 2009 Subaru Forester (SH) is fitted with gas‑charged struts on the rear tailgate, while the bonnet uses a manual prop rod from factory. This is documented in the Subaru Factory Service Manual for the SH Forester (Body – Rear Gate), the Subaru genuine parts catalogue (listing the “Stay Assy – Rear Gate” as a gas type), and widely reflected in aftermarket fitment guides from major suppliers that specify tailgate lift supports for MY2009 Forester. The Subaru Owner’s Manual for this model shows a bonnet prop, not gas struts, which is why bonnet strut kits are typically sold as aftermarket upgrades.

On the tailgate, gas struts do the heavy lifting. Charged with inert gas and a small amount of oil, they control the hatch’s movement so it opens smoothly, stays up securely, and closes without a thump. That makes daily use easier and safer, especially when loading gear. Because the Forester’s tailgate is relatively large, correctly rated struts are essential to hold it at full height and resist the extra load of accessories like a rear spoiler.

As part of routine servicing, it’s smart to inspect the tailgate struts annually. Wipe the chrome shafts with a clean, dry cloth (no grease or silicone on the shafts), check the end fittings for play, and look for oil misting around the seals. Cold weather in Aus/NZ can reveal weak struts, and any hatch that drifts down or won’t rise on its own is due a change. Replacement is straightforward and usually done in pairs to keep even support and correct opening speed. Support the tailgate safely (a prop or a mate), flick the retaining clips at each ball joint, swap the struts one side at a time, then refit the clips and tighten hardware to the manufacturer’s spec. Choosing quality, vehicle‑specific struts with the right force rating avoids slam‑shut behaviour or incomplete lift.

• Common signs they’re worn: tailgate sags or won’t stay up, slow rise, jerky movement, hissing, or visible oil at the seals.
• Why the bonnet lacks factory struts: cost/weight saving, simpler under‑bonnet packaging, and long‑term reliability with a basic prop rod. Many owners still opt for aftermarket bonnet strut kits for convenience.

FAQs

Does the 2009 Subaru Forester have gas struts on the bonnet?
From factory, no. The SH‑series Forester uses a manual prop rod for the bonnet. Aftermarket bonnet strut kits are available and mount to existing points, offering easier one‑handed opening without affecting service access.

How long do tailgate gas struts last on a 2009 Forester?
Typically 5–10 years, depending on climate and use. Heat, cold, and frequent cycling shorten life. If the tailgate won’t self‑lift after the first inch, drifts down, or shows oil misting, replacement is due.

Can only one tailgate strut be replaced?
It’s not recommended. New and old struts will fight each other, causing uneven loading and poor lift. Replacing in pairs restores balanced support and the correct opening height and speed.