6 qts. for both the 3.7 and 5.3 liter engines.
6 quarts according to my manual 5w-30
There is this wonderful thing called an owners manual. It lists such items as oil capacity
It takes 6 quarts of 5w30
6 quarts synthetic 5W-30 Filter is an AC Delco PF46, FRAM PH3506, etc
Oil capacity 2008 Chevy 2500
4.3 quarts with filter change
You will need to drop the oil pan to change the oil pan on a Hummer 2. The oil pan is located in inside the oil pan. You also need to first drain the oil pan of the old oil before you drop the pan.
8 quarts of 5/30w for an oil change
4.0 quarts which includes a filter change.
6.2 quarts with a filter change
I use about 4.25 qt (about 4 L)
Just had the dealership change mine… It's a whopping 8 quarts!