The Mercedes Front Shock 166 Without Wire STAR (Part No. 166 320 25 13 / 166 320 26 13) is a front shock absorber designed for Mercedes-Benz SUVs on the W166 platform, such as the ML-Class (2012–2015) and GLE-Class (2015–2019), equipped with a standard (non-electronic) suspension system. The designation "without wire" indicates that this shock absorber does not include the electronic damping control found in AIRMATIC or adaptive suspension systems. Instead, it uses a conventional hydraulic or gas-pressurized design, offering a mechanical solution for ride control. Branded as STAR, it is either an OEM or OEM-quality replacement part that adheres to Mercedes-Benz specifications for fitment and performance.

Functionally, this front shock absorber is critical for damping the up-and-down motion of the suspension caused by road irregularities, ensuring vehicle stability, ride comfort, and precise steering control. By absorbing the energy from road impacts and controlling the spring’s rebound, it helps maintain tire contact with the road surface, reducing body roll, nose-diving during braking, and overall wear on suspension components. This specific part is ideal for W166 vehicles that do not have adaptive or electronically controlled suspensions, offering a reliable, maintenance-friendly solution for daily driving and long-distance comfort. Proper functioning of this shock absorber is essential for maintaining safety, comfort, and predictable vehicle handling.