Couple things: its not blow by. Blow by is a symptom of poorly seated rings and piston and or skirt problems. Its crank case venting back into the top end. And being the 3.6 is not DI its fine . Fuel washes it all down. Also if you use better synthetic oils, they are less evaporative. You will not need to worry about it. 2.0 is a different story because that is DI, vvt, Cooled Egr and pcv loop.