Originally Posted by isuzurover
				
			
			You always have to drain/fill 3 compartments as they have their own sumps.
I have already stated the reasons I think it is better to just have "one compartment" in this thread, and AFAIK Mal Story and Bill Larmann agree with me, so that is good enough for me.
Another reason is the breather - the swivels don't have a proper breather, changing to one compartment means the axle breather works for everything. 
I have been running the "one compartment" system in my IIA for 10 years, and have never had a problem with it.