Re: Help - advice please! What is happening?
Bill_de is correct on both counts. Anytime there is a significant loss of coolant, and then replenishment, the system needs to be "burped". There is a small allen plug above the water pump (by the thermostat housing) that should be removed when filling the coolant. This gets most of the air out of the system. You'll still have to watch it for about a week and maybe have to add a little more during that time.
The milky stuff in the oil filler neck is fairly common in the winter (more so if you're in a very wet climate) and is completely normal. I would highly recommend you add a catch can to the Hemi (if you haven't already), as this will "capture and eliminate" much of this stuff. It will not, however, completely eliminate it. With a catch can, again if you're in a real wet/damp climate, you may have to empty the can as often as every 600-800 miles. The contents will be, as much of us call it, maynonaise....a mixture of condensation and oil....yuck!!
05 LX/RT & 06 WK/GCO, modded similarly, MDS "ON" Light, Vortex Gens, Debadged, DashHawk, BT Catch Can, SRT CAI W/Add Air Inlet, K&N Filter, Sonnax Trans Press Booster, SC Tuner W/Adv Trans Tuning App, DS Tuner, Cust tube headers w/3 in. catback, Bilsteins, SRT frt/rear bumpers, Eibach SRT Lwr Sprgs & Sways, FRI Sidewinder Cam Adv 2*, 6.1 valvetrain, SLP 25% UD Pulley, BBK 90mm TB, SOS Coils/.060 plug gaps. 20 in. SRT Reps.