Hello Dave, on my 911 (1977) its about a 10 quart change and I pull the engine drain plug, oil tank drain plug and the cooler is left alone as the oil thermostat is at the back of the car and my cooler is up in the right wheel well. The oil is blocked from returning to the engine as the thermostat is closed when cold.
I put in 8 quarts and then let the car idle and check the temp gauge until the car is warmed up and my cooler up front is hot to the touch so that I know that I have full circulation front to back. On my oil level gauge I can see when the stat opens as the oil level gauge will start to rise which shows on the dip stick as well. With a new car I would sneak up on the fill until you know what the base line is for that engine ie when its fulling warmed up as over filling creates problems.
and, use a large capacity drain pain otherwise its ends up looking like the Exon Valdez oil spill.