here are the first two uoas for my new truck. i went from a 1990 sierra to a 2016. i used the dexos 1 m1 5w30 and I think there was some 5w30 extended performance mixed in. still on the fence if im going to use 0w20. if it continues to thin out i will probably stick with 5w30. i use this truck for work and pleasure. i dont tow anything, just haul, and usually its just some tools and ladders. I will probably be driving around 20k a year. Next oil change will be at 10k.