2018 Kia Optima Suspension & Steering Torque Specs

OEM-referenced torque, socket, and thread specs for the 9 front and rear suspension and steering fasteners on the 2018 Kia Optima — including the Front Lower Control Arm Rear Bolt (torques to 70-85 ft-lbs, M12x1.25 thread). Every value is safety-critical; verify against your service manual and use a calibrated torque wrench. Full bolt specs for the rest of the vehicle are linked below.

Control Arms & Ball Joints torque — 2018 Kia Optima

On the 2018 Kia Optima, the control arms & ball joints fasteners are: Front Lower Control Arm Rear Bolt (torques to 70-85 ft-lbs, M12x1.25 thread); Front Lower Control Arm Front Bolt (torques to 70-85 ft-lbs, M12x1.25 thread). Suspension and steering bolts are safety-critical — use a calibrated torque wrench, replace any prevailing-torque (locking) nut that has been removed, and confirm the value against your service manual before reassembly.

Struts, Shocks & Springs torque — 2018 Kia Optima

On the 2018 Kia Optima, the struts, shocks & springs fasteners are: Rear Shock Absorber Lower Bolt (torques to 85-100 ft-lbs, M14x1.5 thread); Front Strut Top Mount Nut (torques to 30-40 ft-lbs, M14x1.5 thread); Rear Shock Absorber Upper Nut (torques to 35-45 ft-lbs, M12x1.25 thread). Suspension and steering bolts are safety-critical — use a calibrated torque wrench, replace any prevailing-torque (locking) nut that has been removed, and confirm the value against your service manual before reassembly.

Sway Bar & Stabilizer Links torque — 2018 Kia Optima

On the 2018 Kia Optima, the sway bar & stabilizer links fasteners are: Stabilizer Bar Link Nut Front (torques to 25-35 ft-lbs, M10x1.25 thread). Suspension and steering bolts are safety-critical — use a calibrated torque wrench, replace any prevailing-torque (locking) nut that has been removed, and confirm the value against your service manual before reassembly.

Steering (Tie Rods & Linkage) torque — 2018 Kia Optima

On the 2018 Kia Optima, the steering (tie rods & linkage) fasteners are: Power Steering Pump Bolt (torques to 22-30 ft-lbs, M10x1.25 thread); Tie Rod End Nut (torques to 25-33 ft-lbs, M12x1.25 thread); Steering Wheel Center Bolt (torques to 30-38 ft-lbs, M16x1.5 thread). Suspension and steering bolts are safety-critical — use a calibrated torque wrench, replace any prevailing-torque (locking) nut that has been removed, and confirm the value against your service manual before reassembly.

How to torque Optima suspension & steering fasteners

Torque suspension and steering fasteners with the vehicle at ride height (wheels loaded) wherever a bushing is involved — tightening a control-arm or sway-bar bushing bolt with the suspension hanging pre-loads the rubber and it fails early. Clean the threads, start every fastener by hand to avoid cross-threading, and make the final pass with a calibrated torque wrench rather than an impact gun. Ball-joint and tie-rod castle nuts take a new cotter pin; never back a castle nut off to line up the hole — only tighten to the next slot.

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