The results of surface tension and of dynamic contact angle measurements performed on a Cahn electrobalance for several solutions of polyisobutylene in mixtures of Decalin and polybutene oil are presented. The solid probe is submitted to cycles of immersion-emersion within the fluid. The force exerted on the solid is recorded vs. the depth of immersion for different values of the solid-liquid relative velocity. Several phenomena are discussed: formation, deformation, break of the meniscus, draining of the fluid. Different behaviours are observed for the polybutene oil and a polymer solution of the same zero-shear viscosity and same static surface tension. This indicates that, in the vicinity of the interfaces, the microscopic structure of the fluid has to be considered.