We have 3 2010 & 2 2011 vans, We were using 5w-30 oil. At around 40,000 miles, they started burning oil. We switched to the same 15w-40 that we run in the 7.3l diesels, and they don't use as much. The 2011 trucks we used 15w40 in them since they were brand new... Login to read more.