Oil and oil products occupy an important place in the industry and transportation sectors, both as bunker and raw materials. Most oil and oil products are transported by sea. The aim of this study was to evaluate the handling capacity of the İzmit Yarımca Port, which is an important hub for Turkey with regards to the transportation of oil and refined oil products. To assess the capacity of the port and to determine the amount of queuing that could form with regards to tug services, the AWESIM simulation program was used. Based on the study results, a comparison was performed between the port’s current annual handling capacity and the maximum amount of cargo it can handle. In addition, by using the study data, the maximum amount of queuing that can form in tug services was also calculated for days with unfavorable weather and sea conditions. This study thus represents a case study performed with the AWESIM modelling program in order to determine port efficiency.