I was poking around under the hood of my new-to-me CUCV last night... There's a silver box looking thing on the firewall a little to the passenger side. It has two spring/wire clamps holding the cover on and some hoses coming in and out. One of the hoses goes noplace, just hangs down, like it's just for purging/venting or something (unless it's hooked up wrong). Can someone tell me what this thing is? If nobody can tell what I'm talking about I'll snap a pic and draw a circle around the thing. Another Q while I'm typing. Does the 6.2L diesel use just any old oil like a gas engine would use? I noticed the filler said only to use this or that types of oil. The type designations meant nothing to me. Thanks.