The lubricating oil composition includes an oil of lubricating viscosity, one or more compounds containing a carboxylic acid functional group or ester functional group the compound represented by

##STR00001##

each R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, and R.sup.6 is independently hydrogen or hydrocarbyl group; at least one of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 is a hydrocarbyl group; and a poly alkylene glycol represented by

##STR00002##

each R.sup.7, R.sup.8, and R.sup.9 is independently hydrogen or hydrocarbyl group and n is from 5 to 1000.

Heat transfer fluids corresponding to mixtures of at least one hydrogen bond donor and at least one hydrogen bond acceptor are provided. The heat transfer fluids can have an unexpectedly high heat capacity relative to the expected heat capacity based on the heat capacities of the at least one hydrogen bond donor and the at least one hydrogen bond acceptor. In some aspects, the heat transfer fluids can also have a sufficiently high electrical resistivity to be suitable for use in environments such as heat management systems in electric vehicles.

Heat transfer fluids corresponding to mixtures of at least one hydrogen bond donor and at least one hydrogen bond acceptor are provided. The heat transfer fluids can have an unexpectedly high heat capacity relative to the expected heat capacity based on the heat capacities of the at least one hydrogen bond donor and the at least one hydrogen bond acceptor. In some aspects, the heat transfer fluids can also have a sufficiently high electrical resistivity to be suitable for use in environments such as heat management systems in electric vehicles.