[uniquecarriers]

Check the oil pump, I had a 05 engine rebuilt at a shop and it to had oil presure the first 1-2 hours then lost presure and toost # 6 rod out the side of the block.
When we dismantled the engine we found the pump had a crack in the casting of the pump and the drive gear brooken away. Don't know if it was stressed when installed or overtightened or maybe a casting flaw.