Volume of a Cavity

Is there a way to find the volume of a cavity within anassembly? The assembly has about 10 parts inside of a cavity wherea volume of oil needs to be placed. I would like to know how muchoil to add without experimenting. I also need to check the volumeonly up to a certain point within the cavity - not the entirecavity depth. Also, is there a way to have SW make a model of theinside of the cavity?SolidworksGeneral