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The actual trend in the field of maintenance in mechanical and electrical machinery, points towards the implementation of the so-called proactive maintenance. In this framework, different parameters of the system are monitored so that the current health state of the machinery can be precisely known. The health state of the lubricating oil is within the set of parameters that are to be monitored. Nearly 40% of the total reported malfunctions in heavy machinery are due to failures in lubrication. Among the different parameters that define the state of lubricant oil, viscosity is one of the most important. Lubricant oil prevents moving parts to get into direct contact so, inadequate viscosity may cause malfunctioning and even a fatal breakdown. Besides, the monitoring of the viscosity can help establishing the state of degradation of the lubricating oil. Magnetoelastic sensors based on the magnetoelastic resonance phenomena …