Schematic behavior of the α_ml and thermohaline parameters for V4142 Sgr. Left: schematic behavior of the mixed length parameter (α_ml) for different values. This parameter regulates the so-called rejuvenation process in the gainer star. Although it has no influence on the evolution of the mass transfer, stellar masses, or binary period, it significantly affects the evolutionary path of the secondary star during mass transfer until the end of optically thick mass transfer, aging it for lower values of α_ml (opposite to the behavior of the gainer star). Right: schematic behavior for different values of the thermohaline parameter, where no significant changes are observed during the evolution of both stars.