Hey just an update i got my truck back from the dealer. they said they were getting exhaust gases in the coolant system and i am getting a low coolant light. The knock i had before is still there. He said he couldn't hear it, I asked him if he was deaf? Anyway on the way home from the dealer my turbo is making a weird noise when I let off at full boost. It didn't do that before. Any sujestions?

search low coolant level post and headgasket.. head gasket goes and the coolant starts dumping in eng.. could be cause of knock.. hope this helps.. sorry to hear

I would also think coolant in your oil can't be good on your turbo bearings. High temps, fast spinning and poor lubrication would make for a detrimental result.

I am not making oil and i don't have smoke from the exhaust on start up or running.