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Here is the whole story as I can remember it. 2007 Suburban 6.0 LTZ 4x4 Started getting the occasional/random Service Sablitrak message at about 140,000 miles. I started trouble shooting ( or part replacing ) shortly afterwords. I soon figured this job was above my skill level and I just didn't have the time to work on it. After all the confusion on the internet about the problem I was having I took it to the Dealership instead of my local mechanic thinking they could handle this best. In the mean time I did start noticing I was have lower then normal oil pressure. So off to the Dealership where I spent lots of money, and was told my problem was fixed several times only to turn around and head back to them and tell them it is still having the issue. At this point it would take about 10 miles to show up. After the third time of me returning it to them and them keeping it a week, the told me I needed a new engine. My Jaw dropped. I called my friend mechanic and talked to him about it and he asked if he could take a look at it. I let him know that the Cam sensor, cam actuator (VVT Sensor?), and magnet had been replaced at the dealership. After looking at it he wanted to change the oil pump. And just like that my problems were solved, or so I thought. The problem started to show its ugly head a few weeks later but not near as often. That was 2 years ago. In that time I have noticed doesn't seem to come on for a long time after a new oil change. Probably takes 500 miles for it to show up. When it does start showing up it really only comes on after driving for 20 or so miles on the highway and then start driving around town. It might have something to do with being good and warmed up before it starts to come around. It rarely comes on at highway speeds only when I start getting over 2000 miles on the oil change. It seems very oil related. I have tried different brands of oil. None seem to make a difference. My normal oil is Mobil1 5w-30. It does not always throw a CEL just the service stablitrak and traction control. Then thats when the Hard shifting starts. After the Stablitrak comes on it does clear in a few miles on its own. I recently put another new cam position sensor on and I pulled the Cam actuator out and cleaned it. Nothing has sense helped other real short oil changes seem to help. I have thought about deleting the VVT , but not sure that would even help. So any suggestions I am open to all.