The invention relates to a lubricating device for a variable speed transmission with an integrated interaxle differential for motor vehicles, on the shaft of the transmission there being at least one synchronizer clutch for shifting one or two lower (slower) gear ratios and the interaxle differential, and the synchronizer clutch and the interaxle differential being supplied with lubricating oil by way of a central longitudinal channel in the shaft and by way of radial channels and/or radial gaps branching off from it. For improved adaptation of the lubricating oil supply in defined driving states of the motor vehicle, there are means which are integrated into the longitudinal channel and which change the lubricating oil supply to the synchronizer clutch and the interaxle differential as a function of the driving speed.