Hello I have a 2018 chevy express cargo van. I changed my oil today myself. Book calls for 6 quarts of oil. I put in 6 quarts of oil. Now oil is barley on the stick. I let the truck sit for over 2 hours after running if to let oil circulate. It;s not leaking dip stick is all the way in. Where is the oil and why is it not showing on dip stick. Thank you for your help. It is a 4.3 chevy express 2500 cargo van. Thank you