There have been many theoretical studies on automotive vibrations; however, most of these studies relied on constant damping coefficients to simulate the vibrations. This research aims to fill that gap by determining the damping characteristics of automotive suspension systems through practical testing on a specialized damper test rig. The characteristics obtained were considered in the vehicle oscillation simulation using a quarter model. The results of this simulation were compared with those from models using constant damping coefficients. The findings indicated that using nonlinear damping characteristics significantly improved the model’s accuracy in reflecting real-world performance, thereby underscoring the limitations of constant-parameter models. This study highlights the importance of incorporating realistic damping characteristics into vehicle dynamic models, which is crucial for enhancing suspension system design. These findings contribute to the development of automotive suspension technologies, providing valuable insights for optimizing ride comfort and reducing noise to improve overall vehicle performance.