Parts for your 2009 Mazda 3-Gas struts

2009 Mazda 3 gas struts — what they do and when to swap them

Based on Mazda’s Body and Workshop Manuals for BK (2004–2009) and BL (2009–2013) series, the Mazda Electronic Parts Catalogue, and major OE supplier catalogues (e.g., Stabilus Lift-O-Mat and Monroe Max-Lift), gas struts are fitted to the 2009 Mazda 3 hatchback’s rear liftgate. The sedan’s boot uses torsion bars rather than gas struts, and the bonnet is supported by a prop rod, not struts. So, gas struts are relevant for the hatch’s tailgate, but not for the sedan boot or the bonnet.

On the 2009 Mazda 3 hatch, the gas struts make the tailgate easy to lift and keep it safely held up while loading the boot. They’re small, sealed dampers charged with nitrogen gas and oil that provide smooth, controlled motion and stop the hatch from slamming shut. When they’re healthy, the liftgate pops up cleanly and stays put, even on a breezy day.

As part of regular servicing, it’s smart to give the struts a quick once-over. A simple wipe of the exposed shafts with a clean, dry cloth helps keep grit off the seals. Don’t lubricate the shafts or seals—grease and silicone sprays can attract dust and damage the sealing surfaces. Temperature matters too: struts feel lazier in cold weather and perkier on hot days, so test them in typical conditions.

• Tell-tale signs they’re on the way out: the hatch won’t stay up, rises slowly or unevenly, needs a shoulder assist to lift, or there’s oil misting around the rod ends.
• Replacement tips: always replace in pairs for balanced lift, support the hatch securely while swapping, and inspect the ball studs and brackets for wear or corrosion.

There’s no set kilometre interval, many factory struts last 5–10 years, but coastal air, frequent use, and high cabin temps can shorten their life. Choosing the right replacements means matching overall length, stroke, end fittings, and the correct charge force for the BL/BK hatch. OE-equivalent units from recognised suppliers follow Mazda specs and will restore the proper lift and hold.

For owners of the 2009 Mazda 3 sedan, boot lift is handled by torsion bars, so gas struts aren’t used there. The bonnet on both sedan and hatch uses a prop rod from the factory, while aftermarket bonnet strut kits exist, they’re not original equipment and should be fitted with care and correct hardware.

Popular questions

Does a 2009 Mazda 3 sedan have gas struts on the boot?
No. The factory setup on the 2009 Mazda 3 sedan uses torsion bars to counterbalance the boot lid. Only the hatchback has gas struts, and they’re on the rear liftgate. If a sedan boot isn’t staying up, the issue is usually with the torsion bars or hinges, not missing struts.

How long do hatch gas struts last, and what are the signs they’re worn?
Many last 5–10 years, but heat, salt air, and frequent use can shorten that. Signs include a hatch that sags or won’t stay up, slow or uneven lifting, needing a hand to start opening, or oily residue on the strut body. If one’s weak, replace both for even performance.

Can Mazda 3 hatch struts be re-gassed, or should they be replaced?
They’re sealed units, so the practical fix is replacement. Re-gassing isn’t commonly offered for small automotive lift supports and may not restore proper damping. Quality OE-equivalent replacements are the reliable, cost-effective option.