The wax appearance temperature as well as the liquid vapor phase boundary were measured on two condensate gases from a high-temperature-high-pressure field in the North Sea. Measurements were performed up to 45 MPa in the temperature range from 293 to 423 K. The experimental temperatures of wax appearance were then compared to the prediction of a. model previously developed for synthetic light gas-heavy n-paraffins systems and adapted here to the representation of live oils.