The purpose of this paper is to carry out various performance measures of a single-unit system with preventive maintenance (PM) beyond warranty by using supplementary variable technique. The unit is considered as degraded after repair beyond warranty. There is single repair facility available with the system for PM and repair of the failed new/degraded unit. Any failure during warranty is rectified by the manufacturer free of cost to the users. The failure time distribution follows negative exponential while PM and repair times distribution are taken as arbitrary with different probability density functions. The expressions for various performance measures of system such as reliability, mean time to system failure (MTSF), availability and profit function have been determined. Steady state behavior of the system has been examined by using Abel’s lemma. The numerical results for reliability and profit function are also obtained by taking particular values to various parameters and repair cost.