Just bought an 07 yukon 3 weeks ago, with 93k miles on it. Over the weekend, while I was at the beach 130 miles away from home, the low oil light comes on at 95k miles. I checked the oil and it was at the bottom of the dipstick. I looked over the truck and couldnt find any leaks. I got on the internet and found out this was a common problem with the 5.3l engines.
I took the truck to the dealer this morning, they said they would fix it under the 100k powertrain warranty. I had the oil changed, and they started the consumption test. So, we will see how this goes.