The 572 delivered from gm comes with a 6 quart oil capacity. Although I would check with Troy to find out if the pan was changed. Most Milodon and Moroso pans are around a 7 quart capacity.
Gm recommends a 20w-50 Synthetic after break in
Here's the gm spec sheet:
http://www.gmperformanceparts.com/_r...Long_Block.pdf
Rich