I have noticed that the before I took my truck in for the last oil change the level was down to the add spot. I have driven about 2500km sonce my last oil change and the oil has dropped a 1/4 of the way down the dip stick. I called the dealership to make an appointment and have them look into it and was told by the service adviser that this is normal. I check my oil regularly and this is the first time that my oil level dropped. The adviser did say that there is a bulletin on this and that he will see if it applies to my truck. Is it normal for the oil level to drop?
Rick

 

The 99 and up trucks are known for this especially when driving for extended periods. I leaned this a while ago towing a trailer from Daytona to my house in South Carolina. I got home and my Yukon was almost a quart low.

 

It is a 2008 Sierra Crew Cab with the 5.3ltr motor.