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Measurements of the dynamic viscosity and density of a ternary system composed of methylcyclohexane + cis-decahydronaphthalene (cis-decalin) + 2,2,4,4,6,8,8-heptamethylnonane have been performed for 13 different compositions at 7 isotherms in the range 293.15 K to 353.15 K and 6 isobars up to 100 MPa. The viscosity was measured with a falling-body viscometer, except at 0.1 MPa, where a classical capillary viscometer (Ubbelohde) was used. The experimental uncertainty for the measured viscosities is <2%. The density was measured up to 60 MPa with a resonance densimeter and extrapolated with a Tait-type relationship up to 100 MPa. The uncertainty for the reported densities is <1 kg‚m -3 . The measured data (546 data points for the viscosity) have been used in an evaluation of the simple mixing laws of Grunberg and Nissan and of Katti and Chaudhri. This evaluation showed that these mixing laws, despite their simplicity, can represent the viscosity of this asymmetrical ternary system with a satisfactory accuracy.

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