Composition for Cooling and Lubricating a Propulsion System of an Electric or Hybrid Vehicle

The present invention relates to the use, for cooling and lubricating a propulsion system of an electric or hybrid vehicle, of a composition comprising: (i) at least one base oil; and (ii) at least one diester of formula R—C(O)—O—([C((R))]—O)—C(O)—R(I), different than the base oil (i). The invention also relates to a method of cooling and lubricating a propulsion system of an electric or hybrid vehicle comprising at least one step of bringing at least one mechanical component of said system into contact with a composition as defined above.