This paper presents a new high temperature dynamic viscosity sensor for in situ condition monitoring
of engine lubricants. The sensor is used to measure the variation in the quality factor of a vibrating
piezoelectric cantilever beam due to viscous damping. The sensor was used to measure the dynamic
viscosity of various single and multi-grade engines oils up to 180 cP from 25 ◦C to 60 ◦C. The sensor is
capable of detecting degradation and dilution of engine oil for both new and used samples of 5W-30 and
10W-40 and diluted SAE 30 engine oils. All of the viscosity measurements presented are within 0.13–9.8%
of the results obtained using the standard Walther equation at various temperatures. An equation relating
dynamic viscosity of an oil sample to the quality factor of the beam is presented. The quality factor
measurement circuit presented in this research can be implemented in automotive applications for in situ
condition monitoring of lubricant viscosity.