5 quarts
on the engine
5w30
Inside the oil pan mounted on the engine block.
On the Oil Pan.
The Chevy Colorado was first introduced in 2004 and gets up to 18 mpg in the city. The type of oil the manufacturer recommends is an ACDelco dexos1 Synthetic Blend.
5.7 qts. with filter change
It's about 5.75 quarts with a new oil filter.
The 2008 I5 3.5 takes 6 qts with oil filter.
GM recommends 5W-30.
It should be 15mm.
SAE 5W-30