The viscosity (eta) and the density of 3-methylpentane (3MP), 2,3-dimethylpentane (2,3DMP), methylcyclohexane (MCH), methylcyclopentane (MCP), and of the 1:1 mixtures MCH/MCP and 3MP/Isopentane were measured from 293 K down to either the freezing point or to the temperature at which eta almost-equal-to 10(6) mPa s. For the glass-forming solvents 3MP, 2,3DMP, MCH/MCP, and 3MP/Isopentane eta(T) can be represented by the sum of two Arrhenius terms and one Vogel-Tammann-Fulcher term: eta(T) almost-equal-to A1 exp(E1/RT) + A2 exp(E2/RT) + A3 exp[E3/R(T-T0)]. For the smaller viscosity ranges of the two crystallizing alkanes MCH and MCP, two Arrhenius terms are sufficient for the description of eta(T).The viscosity (eta) and the density of 3-methylpentane (3MP), 2,3-dimethylpentane (2,3DMP), methylcyclohexane (MCH), methylcyclopentane (MCP), and of the 1:1 mixtures MCH/MCP and 3MP/Isopentane were measured from 293 K down to either the freezing point or to the temperature at which eta almost-equal-to 10(6) mPa s. For the glass-forming solvents 3MP, 2,3DMP, MCH/MCP, and 3MP/Isopentane eta(T) can be represented by the sum of two Arrhenius terms and one Vogel-Tammann-Fulcher term: eta(T) almost-equal-to A1 exp(E1/RT) + A2 exp(E2/RT) + A3 exp[E3/R(T-T0)]. For the smaller viscosity ranges of the two crystallizing alkanes MCH and MCP, two Arrhenius terms are sufficient for the description of eta(T).