The thermal performance of a lubricant is important for electric-mechanical systems such as electric vehicles. To date, understanding of the dynamic thermal behaviour of a lubricant is lacking due to difficulties in direct measurement during operation. This research investigates an alternative approach using electrochemical impendence to measure the fluid film thickness under shear at various temperatures. A mineral oil and polyalphaolefin (PAO) were used as experimental models. Results showed that thermal properties of lubricants depended on the shear and were not a constant as is widely accepted. Analysis revealed that the mineral oil had higher dynamic thermal conductivity than that of PAO, due to their unique formulas This research discovered the possibility of dynamic properties of a working lubricant.

润滑剂的热性能对于电动机械系统（例如电动汽车）很重要。迄今为止，由于在操作过程中难以直接测量，因此对润滑剂的动态热行为缺乏了解。本研究调查了一种使用电化学阻抗测量不同温度下剪切下的流体膜厚度的替代方法。矿物油和聚 α 烯烃 (PAO) 用作实验模型。结果表明，润滑剂的热性能取决于剪切力，并不是广泛接受的常数。分析表明，矿物油具有比 PAO 更高的动态热导率，这是由于其独特的配方。这项研究发现了工作润滑剂的动态特性的可能性。