look in your owners manual but it should be conventional 5w 40.
mobil 1
5w-30 synthetic will work fine.
On the bottom.
look in your owners manual and see what weight oil they recommend and then get that weight oil in the synthetic oil that you like.
10w30
About 5.5
About 5.5
Not required for the 5.7, strongly recommended for the 6.1
look in your owners manual but I would say a synthetic oil of 5w-40.
The capacity is just about 6 quarts, preferably a full synthetic 5w-20 for lower mileage engines and 5w-30 for anything over 40k
I believe it's 6 qts.
5w-20 is recommended to ensure proper MDS operation. I highly recommend using a full synthetic oil.