This paper presents a case study and a model for condition monitoring of Diesel engines' oil of urban buses, through the accompaniment of the evolution of its degradation, with the objective to implement a predictive maintenance policy. Along time, because the usage, there is some decay in the lubricant properties. However, in normal functioning conditions, the lubricants properties, at the time the manufacturers recommend its changing, usually, are within the safety limits. Then, based on the accompaniment of the lubricants' oil condition, the intervals of oil replacement can be enlarged what implies the availability increasing of the equipment. The model presented in this paper shows its potential to be spread to other types of equipment and organisations that want to implement similar maintenance policies, to achieve the best availability based on the real equipment functioning conditions.
