Parts for your 2005 Subaru Forester-Gas struts

2005 Subaru Forester Gas Struts — What They Do and When to Replace Them

Gas struts are absolutely relevant to a 2005 Subaru Forester. Technical references back this up: Subaru’s 2005 Forester owner’s manual describes the bonnet being supported by a prop rod (not gas struts), while the rear liftgate uses “stays” that hold the gate open—these are gas-charged struts. Likewise, Subaru’s electronic parts catalogue for the SG-series Forester (2003–2008) lists “rear gate stay assemblies,” and major application catalogues from recognised gas-spring manufacturers (e.g., Stabilus, Monroe) specify rear liftgate gas struts for this model. So, while the bonnet uses a manual prop, the tailgate relies on gas struts from factory.

On the 2005 Forester, the gas struts take the heavy lifting out of opening the rear tailgate and keep it safely parked overhead. They’re nitrogen-charged dampers that balance smooth movement with controlled resistance, so the hatch doesn’t slam or drift. That’s a big deal when loading gear, prams, or the weekly shop—no-one wants a tailgate thudding down on their shoulders.

Like any wear item, gas struts lose pressure with age, temperature swings, and general use. There’s no fixed replacement interval, but five to ten years is common depending on climate and usage. Practical guidance for servicing this Forester includes replacing struts in pairs to keep lift and damping even, and supporting the hatch securely during the job—don’t rely on tired struts. Most replacements use simple ball-and-clip fittings: carefully lift the spring clip with a small flat screwdriver, pop the socket off the ball stud, and reverse the process to install the new unit. Inspect the ball studs for corrosion or looseness and renew them if worn. Owners should also be mindful of added accessories like a heavy spoiler or rack gear, extra weight can demand higher-force struts.

• Common signs they’re due: the tailgate drops or won’t stay up, it lifts slowly (worse in cold weather), you see an oily film on the strut body, or it needs a helping hand to get moving.

Simple care goes a long way: keep the shiny rod clean and free of nicks, avoid grabbing or clamping it, and don’t spray petroleum solvents on the seals. Fit new struts rod-end down where possible so internal oil keeps the main seal lubricated. Gas struts are sealed units—no regassing or DIY refilling—so replacement is the correct fix when performance fades. Done right, fresh struts restore that easy, one-hand lift the Forester is meant to have.

Popular questions

Do 2005 Foresters have gas struts on the bonnet or just the tailgate?
From factory, the 2005 Forester bonnet uses a prop rod, not gas struts. The rear liftgate is supported by a pair of gas-charged struts (“stays”). Aftermarket bonnet-strut kits exist, but they aren’t original equipment on this model year.

How often should tailgate gas struts be replaced on a 2005 Forester?
There’s no set kilometre interval. Replace them when the hatch won’t stay up, lifts slowly (especially in cold weather), or shows oil seepage. In typical Aussie and Kiwi conditions, many sets last around 5–10 years, but exposure to heat, dust, and added tailgate weight can shorten that.

Can Forester gas struts be re-gassed or adjusted?
No. The OEM-style gas struts are sealed and non-serviceable. When performance drops, the correct remedy is replacement with quality, correctly rated units—ideally as a matched pair.