More flow to intercooler is achieved by knocking teeth off of the wheels on your turbo.I just buy whatever dino oil is the cheapest at the big box store and generally run it for 15-20k. I don't run an oil filter anymore as I need more flow to my intercooler. With the ammount of blow by I get on my piston rings I may just stop oil changes all together and just top off. That is what the VQ35 guys do.
Less restriction = more airflow. Ask anybody that knows the basics.
Hope this helps.