Here are the essential points: 2012 Chevy Suburban 4x4LT with 5.3 FlexFuel Recommended - Dexos1 AC Delco Synthetic blend 5W-30 When oil life indicator on dash says or every 3k We live in eastern Kentucky on the border with West Virginia. Daily commute is 2 miles but this is our travel vehicle. Every other weekend is a 300 mile round trip Does occasionally tow a boat(4k lbs) once a month, not real hard pulls but Terrain is hilly. I drive fast, but she drives majority of the time and is is a speed limit person. No known problems. Have been going about 5k in between oil changes when oil life indicator says so. Like to keep it there. We have a Advanced Auto, Autozone, NAPA, Walmart, and GM dealer local. Would prefer to buy local, but am up for best bang for the buck.