The invention relates to lubricating grease compositions comprising (a) at least one highly viscous, fluorinated oil having a viscosity of between 500 - 1500mm2/s, (b) boron nitride and (c) a binder which is selected from bentonite, alkali metal phosphates, aluminum phosphates, alkali metal silicates, alkaline earth metal silicates, aluminum silicates, alkaline earth metal carbonates, calcium borate, silicon dioxide, titanium dioxide, aluminum oxide and mixtures thereof. Said lubricating grease compositions can be used, in particular, in a high-temperature range, for example for greasing ovendrawer rails.