Parts for your 2021 Mazda Cx-5-Gas struts

2021 Mazda CX-5 gas struts — what they do, and when to replace them

Based on technical sources including the 2021 Mazda CX-5 Owner’s Manual and Mazda’s workshop/parts documentation for the KF series, gas struts are fitted to the rear tailgate/boot of this model, while the bonnet uses a support rod rather than gas struts. The manuals describe a hood support rod procedure for the bonnet, and list “liftgate stays” (gas-charged struts) for the rear door assembly. So, gas struts are absolutely relevant on a 2021 CX-5 — specifically for the tailgate (and for power tailgate variants, powered lift supports are used).

On a 2021 Mazda CX-5, the rear gas struts hold the tailgate up smoothly and safely, making daily use dead easy. They’re nitrogen-charged dampers that control lift and slow the last bit of closing, so the boot doesn’t drop or bounce. Over time, seals wear and pressure drops, especially with age, heat, cold mornings, and frequent use — that’s when the tailgate starts to sag, lift slowly, or needs a shoulder nudge to stay up.

As part of regular servicing, it’s smart to check the tailgate struts. A quick test: open the boot fully and leave it — if it creeps down, feels weak in cold weather, or you can see oil mist on the shaft, it’s time. Most workshops recommend replacing in pairs to keep lift balanced and predictable.

• Common symptoms of tired struts:
  • Tailgate won’t stay up or drops in a breeze
  • Slow or uneven lift, worse on cold mornings
  • Visible oil weep or pitting on the chrome rod
  • Clicking or binding at the ball sockets

Replacement is straightforward on manual tailgates: safely prop the door, pop the retaining clips, swap struts, and confirm smooth operation. Always support the tailgate — it’s heavier than it looks. For CX-5s with a power tailgate, use genuine or OE-spec powered supports and follow the workshop procedure, some models need initialisation or calibration after fitting.

Care-wise, keep the rods clean and dry — a quick wipe during a wash is enough. Don’t grease the shafts (it can attract grit and damage seals). Expect a service life of 4–8 years depending on climate and usage. If the vehicle often parks nose-up on steep driveways or carries roof loads, the struts work harder and may age faster.

Choosing quality replacements pays off: correct force rating, right-length rods, and corrosion-resistant fittings keep the CX-5’s tailgate feeling factory-fresh and safe for the family.

FAQs

Does the 2021 Mazda CX-5 bonnet have gas struts?
No. The bonnet uses a support rod as described in the owner’s manual. Gas struts are used on the rear tailgate only. If bonnet struts are desired, aftermarket kits exist, but they’re not an OEM fit on this model year.

How long do CX-5 tailgate gas struts usually last?
Typically 4–8 years in Australian and New Zealand conditions, depending on heat, cold starts, usage, and exposure. If the boot won’t stay up or feels weak on chilly mornings, plan a pair replacement.

Can the CX-5 bonnet be upgraded to gas struts?
Yes, there are aftermarket kits. Use model-specific brackets and check clearance to avoid fouling the guard or bonnet. For new-car warranty considerations, ask your dealer before fitting non-genuine hardware.