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Life Cycle Cost (LCC) is a method which is used to calculate all costs over the use’s period that can be seen from the economic aspect to determine the alternative design. This method is also used to help for making a decision. The purpose of this research is to design a strategy to assist companies for making decisions in purchasing and inventory of critical parts engine based on the lowest cost. The result of this research is the company’s current strategy of breakdown maintenance costs Rp. 508,574,008.40 for one year of production. Meanwhile the results of the proposal strategy are preventive maintenance with Monte Carlo simulation tool to predict the amount of parts and when the inventory parts of the engine need to be replaced. The proposal strategy costs Rp. 786,968,691.40 for three years of production. So, it can be concluded that by using LCC calculation with Monte Carlo simulation tool, it can help the decision maker to determine the minimum cost in long term period.

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