I have decided to discontinue use of Shell Gas Truck. Sorry BobIsTheOilGuy forum. Ive looked over different UOAs and it seems this oil shears too much. Now Im not an engineer, scientist or doctor and Im just guessing based on internet readings. I think sheering has something to do with the cam phasers going bad. I tip my hat to you guys running 5W40, but Im taking my truck to get the oil changed to Rotella T6 5W30 and after 4500 miles do a Blackstone sample.