Parts for your 2019 Mazda 3-Gas struts

2019 Mazda 3 gas struts — what they are, where they’re used, and how to keep them sweet

Gas struts are fitted to the 2019 Mazda 3 hatchback (BP series) on the rear liftgate. Mazda’s own technical literature confirms this: the Mazda3 (BP) Workshop Manual, Body section (“Liftgate/Back Door — Liftgate Stay Removal/Installation”) specifies gas stays for the hatch, while the Bonnet section details a simple prop rod rather than hood struts. The Mazda Electronic Parts Catalogue for BP-series likewise lists a “Liftgate Stay” for the hatch and a “Hood Support Rod” for the bonnet, the sedan’s boot uses torsion bars rather than gas struts. Owners’ Manuals for 2019 BP models also show a bonnet support rod. So, gas struts are relevant to the hatch’s liftgate only, not the bonnet or sedan boot.

On the 2019 Mazda 3 hatch, the gas struts do the heavy lifting for the back door, helping it rise smoothly and stay put overhead. They’re sealed, nitrogen-charged dampers that balance the weight of the liftgate, making everyday loading a no-fuss affair. Over time, seals age and pressure drops, especially noticeable on cold mornings, that’s when the hatch might sag or refuse to stay up.

As part of routine servicing, a quick health check of the gas struts pays off. Look for oil misting around the rod seal, uneven extension, or a liftgate that rises slowly or won’t hold at the top. Any of these signs means replacement time. It’s best practice to replace in pairs so the opening force and damping are matched left to right.

Replacement is straightforward for a trained tech: safely support the liftgate, pop off the retaining clips, swap the struts, and confirm smooth, secure operation. Re-using worn ball studs or forcing new struts onto dirty mounts is a no-go — clean the pivots and check for play. Don’t lubricate the chrome rod, oils and silicone can damage the seals and attract grit. A light wipe with a clean, dry cloth is all that’s needed.

Quality matters. Choosing OE or reputable aftermarket struts built to the BP hatch spec keeps the opening height, speed, and hold force right where Mazda intended. In typical Aussie and Kiwi conditions, many owners see 5–8 years of service life, but high heat, dust, or frequent use can shorten that. If the liftgate doesn’t stay confidently overhead, prioritise replacement — it’s a small job that prevents big headaches.

• Tell-tales: hatch dropping, slower rise, or rod oiling
• Service tip: replace in pairs, don’t grease the rod
• Safety: always support the liftgate during work

How long do 2019 Mazda 3 hatch gas struts usually last?

Many owners get 5–8 years, but climate and usage matter. Heat cycles, dust, and frequent opening can shorten life. If the hatch no longer stays up or feels lazy, that’s the cue to replace both struts.

Can just one gas strut be replaced?

It can, but it’s not recommended. A single fresh strut working with a tired mate can twist the liftgate and open unevenly. Replacing in pairs keeps the forces balanced and the action smooth.

Why does the hatch sag more when it’s cold?

Gas pressure drops with temperature, so a marginal strut can feel much weaker on a cold morning. If cold weather exposes a sag or slow rise, the struts are nearing the end of their service life.