I have a 04 with the 6.0 stock in it. I had it put on a computer and they said injector three was bad so changed it but no difference. when I start the truck from cold, it will blow blueish white smoke and if I go to drive it, it doesn't have the normal power for it. You have to baby the pedal and it blows the smoke. But once it is up to temp, it runs great, no smoke and no problems, normal power. I took it back and had him put the computer back on it and no codes so left it over night to do it with it cold and same they, no codes. It blew the smoke at start up for him, he said I have a vavle seal went bad and is leaking oil past it. This doesn't sound right to me, I would think the oil would burn right up at start up?

I'm not losing any coolant or oil.

Any ideas?

Thanks for your help

 

He maybe right. Oil will drain into a cylinder through a bad seal in the head, around and down the valve. When you start it up you'll get the puff of smoke until it has burned all the residual accumulation in the cylinder. Once engine reaches optimum temp. expansion takes affect and you won't see the smoke. Again, when the engine cools down the oil will begin to pass around the worn seal thus entering back in the cylinder. If that is the problem the question is, which bank, which cylinder and which valve seal is it... How did he arrive at that conclusion in the first place? But, then again it may not be a valve problem and you have another issue such as egr or oil cooler problems.

 

Not sure how he came up with that, I think it was a guess the way he explained it to me. I understand what oil could do and howit would get there. If it was oil, won't it burn off quickly? It takes a few miles if I drive it or 10 to 15 minutes if I let it sit and warm up. He said that when he started it the next morning, that it was like one cylinder wasn't firing at first but nothing showed up on the computer.

 

If the engine is cold it may continue to allow passage of oil until the engine warms up. Once the engine is at operating temp. you have expansion and the leak will cease until the engine cools back down when you shut it off for awhile. Now this is hypothetical. With the 6.0 engine, it could be because its that time of the month, (figure of speech only). Personally, I believe you might have some coolant passage which is why I mentioned egr and oil cooler earlier. Been there, done that on my truck. If you doubt what he said then you might consider taking it to someone else. Are you still under warranty? If not, then you might start looking for someone locally that is familiar with the 6.0. that can help you. Generally if it's coolant you'll have the tell tail sign with coolant blowing out the reservoir, if you throttle it hard. If that occurs then it is usually an egr cooler, oil cooler or the dreaded headgaskets blown.

 

I went threw all that with my other truck so I know what you mean, head gaskets suck to do on these. It is out of warranty, and I've been looking around but not many deisel guys around me.