Parts for your 2018 Toyota Mark x-Gas struts

Are gas struts used on the 2018 Toyota Mark X?

After checking factory documentation and parts catalogues, gas struts aren’t fitted to the 2018 Toyota Mark X (GRX133). From the factory, the bonnet is supported by a steel prop rod, and the boot lid uses gooseneck hinges with torsion bars—no gas “stay” cylinders are listed or shown for either end on this model year.

Technical references reviewed:

• Toyota Mark X Owner’s Manual (GRX130/133, 2018): shows a bonnet support rod procedure, no bonnet gas struts.
• Toyota Electronic Parts Catalogue (GRX130/133, Body sections): lists a hood support rod and deck lid hinges/torsion bars, no hood or boot gas stay cylinders.
• Toyota Repair Manual, Body Mechanical – Hood/Deck Lid (GRX130 series): service steps reference the prop rod and torsion bar adjustment, not gas stays.

Why no gas struts? Toyota engineered the Mark X with a simple, durable setup that keeps weight and cost in check without sacrificing everyday usability. The prop rod is light, reliable, and cheap to replace if bent. The boot’s gooseneck/torsion-bar arrangement provides a broad opening and consistent closing feel without the long-term pressure loss that gas struts can suffer in harsh temperature swings. It also means fewer sealed components to age, leak, or squeak later on.

For owners who prefer a hands-free bonnet lift, aftermarket bonnet-strut kits do exist, but they’re not an OEM fitment. Properly installed kits add brackets at the guard and bonnet, and care is needed to avoid fouling wiring, washer hoses, or the bonnet’s closing line. The boot is a different story: converting a gooseneck/torsion-bar boot to gas struts is a custom job and generally not recommended, as it changes load paths and can affect panel alignment.

• Does the 2018 Mark X have gas struts on the bonnet or boot?
  No. The bonnet uses a prop rod, and the boot uses torsion-bar gooseneck hinges. There are no factory gas “stay” cylinders on either end for the 2018 model.
• Can gas struts be retrofitted to the bonnet?
  Yes, aftermarket bonnet-strut kits are available. Choose a kit designed for the GRX130/133 shell, use stainless hardware, and check clearances around the guard and bonnet frame. If unsure, have a professional fit and test for smooth opening and proper bonnet latch engagement.
• What maintenance is needed without gas struts?
  Keep hinge pivots lightly lubricated, ensure the prop-rod grommets and clips are secure, and check the boot hinges/torsion bars for squeaks or imbalance. If the boot lid pops too hard or won’t stay up, have a technician inspect torsion-bar preload and hinge fasteners.