How oil do you put in your 2005 Chevrolet Express van?

For a 2005 Chevrolet Express van, you typically need to use 5W-30 motor oil. The engine oil capacity is about 6 quarts, including the oil filter, so make sure to check the owner's manual for the exact specifications and any recommendations for oil brand or type. It's important to check the oil level regularly and change it according to the maintenance schedule for optimal engine performance.