Disclosed are liquid coolants for electric systems and methods of making the same. An example liquid coolant for electric systems may comprise: a base oil, wherein the base oil is a major component of the liquid coolant; and a dissolved gas in an amount sufficient to have a measurable effect on fluid viscosity of the liquid coolant; wherein the liquid coolant has a kinematic viscosity at 100 C. of about 7 cSt or less.

A durable lubricating and cooling fluid for an electric motor system including an auxiliary pumping mechanism. The fluid includes a lubricating base oil, a sulfur system, a nitrogen system, and a phosphorous antiwear system. The lubricating and cooling fluid includes selected amounts of sulfur, nitrogen, and phosphorus provided by the system to provide acceptable wear and friction performance, electrical conductivity, and the ability to minimize wear loss of pumping components making the fluid suitable for use in electric motor system.

An electric motor lubricating fluid for an electric motor system including a lubricating base oil, a tolyltriazole corrosion inhibitor, an oil-soluble phosphorus antiwear additive, and a sulfonate detergent in amounts to facilitate effective performance in copper leaching and extreme pressure scuffing when in the presence of the tolyltriazole.