Running underneath the AOS is the line from my heat exchanger to my intercooler for the supercharger. I added 2 Ts to this line with hoses that run to the rear chamber on the AOS. What this does is allow the hot intercooler fluid to heat the AOS so the oil that gets separated doesn't congeal when it's cold and clog up the oil drain line. This fluid compartment is machined as a separate chamber in the AOS so no risk of contamination back into the oiling system.