Squeeze film flow between a flat plate and a spherical surface subjected to sinusoidal oscillations is investigated. Transmitting force generated in the squeeze films is measured and calculated with a constitutive equation yielding the stress overshoot and the following results have been obtained: The force measured for Separan solutions oscillates with smaller amplitude than for purely viscous liquids and shows a phase lag in comparison of the force of the viscous liquids. Numerical calculation using the constitutive equation gives guantitative or qualitative agreement with the experimental data for the phase lag or for the amplitude, respectively. The energy dissipated in the Separan solutions in one cycle is less than that evaluated for the purely viscous liquids. An apparent Deborah number respectively correlates to each of the decrease in amplitude, the phase lag and the dissipation of energy taken for various experimental conditions. In the analytical results, an impulse evaluated by integrating the force in one cycle gives a positive value and this means that two surfaces are forced to separate by sinusoidal oscillations.