The growing need for resource optimization and the higher level of customer use in terms of quality of service, cost and time have an influence on the reconfiguration of global markets. To remain competitive, the companies have been forced to invest mainly in their supply chain in order to ensure survival in the increasingly competitive market. Outsourcing is a great ally to logistics, more specific to 3PL (Third Party Logistics), which was pointed out by several authors when talking about reducing costs, improving service quality, improving controls, integrating processes and implementing new technologies without prevent the company s focus on its Core Business. The objective of this dissertation is to conduct a case study at Petrobras in order to identify why the Managers chose to migrate their outsourcing structure from a 2PL to a 3PL. The results showed a 34 percent cost reduction, confirming a proposal to adopt the 3PL system that reduced logistical costs; investments in governance structures involved in reducing transaction and control costs, goals and indicators that are related to performance, in addition to the contribution to chain management.