This paper deals with maintenance outsourcing in product-service system (PSS) as a new service –oriented manufacturing. As a new service, the PSS is a new opportunistic to manage maintenance for complex system. We develop a lease-oriented maintenance methodology under product-service system that applied in public transportation (i.e. bus). Maintenance is used to reduce the occurrence of damage and downtime. The degradation process is considered to be influenced by age, usage and operating condition. This paper is a black-box model which regarded as a limitation of the model. The purpose of the paper has two-folds. Firstly, it is to show that the traditional maintenance does not perform satisfactorily when facing with a complex system and secondly to show how PSS with lease contract can performs better. For maximizing the leasing profits, we use a Nash game formulation to determine the optimal solution and considered remaining useful life (RUL) distribution to model   This paper deals with maintenance outsourcing in product-service system (PSS) as a new service –oriented manufacturing. As a new service, the PSS is a new opportunistic to manage maintenance for complex system. We develop a lease-oriented maintenance methodology under product-service system that applied in public transportation (i.e. bus). Maintenance is used to reduce the occurrence of damage and downtime. The degradation process is considered to be influenced by age, usage and operating condition. This paper is a black-box model which regarded as a limitation of the model. The purpose of the paper has two-folds. Firstly, it is to show that the traditional maintenance does not perform satisfactorily when facing with a complex system and secondly to show how PSS with lease contract can performs better. For maximizing the leasing profits, we use a Nash game formulation to determine the optimal solution and considered remaining useful life (RUL) failure distribution.