Here goes! My truck has been great and I just wanted to give it a check. On this oci, i did a lot of four wheeling in the mountians on unmaintained dirt roads for hunting season, a trip to ohio and back with a 5000lb boat. (little over 500 miles)I need to see what is leaking, because it leaks a little under a quart every 1000 miles. I suspect the valve covers, but I have not had the time to get in there and find out yet. Either way, it seems to be doing well. Mobil 1 5w-30 High milage with P1 filter.