Parts for your 2018 Toyota Mark x-Coil springs

2018 Toyota Mark X coil springs — what they do and when to service them

Coil springs are fitted to the 2018 Toyota Mark X. Technical literature for the GRX130/135 series — including Toyota’s New Car Features and Repair Manual — specifies a front double‑wishbone suspension with coil springs and a rear multi‑link suspension with coil springs and separate shock absorbers. Toyota’s Electronic Parts Catalogue for this model also lists front and rear coil spring part numbers by variant (including GR Sport).

On the 2018 Mark X, the coil springs carry the vehicle’s weight, hold the ride height, and work with the shocks to keep the tyres planted over bumps and through corners. That balance is a big part of why the Mark X feels composed and predictable, whether cruising the motorway or threading a twisty B-road. Different trims (such as GR Sport) use springs with sportier rates to sharpen body control while keeping daily comfort in check.

As part of regular servicing, the coil springs deserve a look every 10,000–15,000 kilometres. Springs can fatigue, corrode, or crack over time, especially if the vehicle sees rough roads or coastal air. Tell‑tale signs include a lower ride height on one corner, a thumpy or crashy feel over bumps, uneven tyre wear, or a sharp clunk as a broken spring tail shifts in its seat.

• Inspect for rust flaking, cracked paint, or broken coils, and check rubber insulators, bump stops, and top mounts at the same time.
• Replace springs in axle pairs to keep handling even left‑to‑right, and book a wheel alignment afterwards.
• Avoid heating or cutting springs, if lowering, use properly rated springs matched to suitable dampers.
• Use quality components (genuine or reputable aftermarket) and correct seat orientation, torque everything at normal ride height to prevent bush bind.

Safety is key: coil springs store a lot of energy. The job calls for the right compressors and procedures, so it’s best left to a qualified workshop. As a rough guide, expect 1.5–3.0 hours’ labour per axle, plus an alignment. With fresh, correctly rated coil springs, the Mark X regains its factory ride height, quietness, and that planted rear‑drive feel owners appreciate.

Popular questions about 2018 Toyota Mark X coil springs

What are the common signs the Mark X’s coil springs need replacing?
A sagging corner, uneven ride height, clunks over speed humps, a harsh bottom‑out, or new uneven tyre wear point to tired or broken coils. Visual checks often reveal chipped coating, heavy rust, or a snapped pigtail end sitting out of its seat.

Should coil springs be replaced in pairs on a Mark X?
Yes. Replace springs in left/right pairs on the same axle to keep spring rate and ride height even. Mixing an old and a new spring can upset handling balance and braking stability.

Are GR Sport coil springs different from standard Mark X springs?
They can be. GR Sport and some option packs use different rates and free lengths. Always match by VIN or option code to get the correct ride height and handling the chassis was tuned for.