Started today. 2004 with 235k miles. Owned for last 10k miles.
Engine was recently studded, has egr delete and ccv bypass. Runs and starts fine. New Ford oil cooler too.
Checked for codes. None for misfires, perdel are reading 0.
If it sits, on start up clear exhaust, as it warms, more blue smoke. Smells like oil not diesel.
Researched before asking and found leaking turbo seals can cause this. So we pulled the intercooler tube in front of the engine going to the intake expecting to find oil residue. Nice and dry. Was this the correct one to look at?
When we got the truck we had the dealer do a relative compression test and was within limits, it did need 1 injector that we replaced.
What would be the next logical place to look?
Thanks

Couple more points, just changed oil last week, checked today, it was slightly over full.
Coolant is fresh and has not changed level since we got it.
Pulled fuel filter to see if any oil, but it was nice and clean.

 

wrong pipe


Pull the down pipe going out the turbo
its the one against the firewall going out to the exhaust


should be dry black soot not shinny black

 

Thanks for the input, thought that was too easy. Will try looking again tonight.

 

Update, started removing the CAC tube exiting the turbo, heading to the passenger side intercooler. Pulled it off, full of oil. I have the cvt rerouted, so it is not crankcase vent oil.
I assume this confirms a leaky turbo seal?
Anything else lets oil into this tube?
Thanks
I have a turbo shop relatively close. Deciding if I want to rebuild myself or have it done.

 

Still the wrong pipe.... exhaust pipe, not a CAC pipe leading to the intercooler. But if it's full of oil, might mean your intercooler is full of oil as well. The down pipe almost touches the firewall and has a v-band clamp on it, leads down the firewall and out the back.

Nothing else feeds it, leaking seal, time to rebuild it. Rebuilds not hard, plenty of videos to watch how.

 

Yeah, I understand still the wrong pipe, but as I was searching, this oil pool showed up, so I figured I didn't really need to much farther.
One question though, I watched a video about searching for oil leaks. Pointed out a common oil leak comes from a crack in the elbow of the tube I removed. Why would oil even be in there unless a turbo seal was leaking?
Am I missing something? Fixing the fracked elbow is good, but don't you have to find the source of the oil too?

 

a turbo creates vac pressure in the crank case
thus a CCV System

we all have a small amount of oil in those tubes going to intake

there shouldn't be a lot of oil but there will always be some let's say a small snail trail but not excessive amount

 

if there is a lot of oil in charge air side it needs checked for excessive blowby

 

Here's a video from Anthony of a turbo failure that pushed the motor oil from the turbo feed into the Cold Air Charge (CAC) hot side side.
Like said already, You need to also pull the down pipe of the exhaust outlet on the turbo and check for oil. If it's wet then the turbo needs to be rebuilt or replaced. I'd also then pull the intercooler and make sure you don't have it full of oil too.

 

Interesting video. I didn't have nearly that much oil in the tube.
So that elbow can collect blow by oil, but since I have the crankcase vent rerouted to atmosphere, that is not blow by in mine. I am checking out prices for new vs rebuilt around here.
Too bad I didn't notice this a couple weeks ago when the outside temps were in the 50-60s. Today it is 7.
Thanks again

 

Update on the smoke. It had recently dropped in outside temps to single digits for a few days. When we had done our diagnosis, the truck sat in a warm garage overnight. Next day drive the truck out, expecting the smoke to reoccur, but it never did. Been driving for a week now, no smoke at all, warm or cold.
Theory- could the rerouted crankcase vent have plugged from frozen condensation? It runs to the rear axle.
The plugged vent caused the oil to seep past the turbo seals. But when we warmed it up overnight the plug went away, and now no more back pressure?
Sound reasonable?

 

The oil in the system is at 75 psi or higher, turbo won't make that much pressure.

Back pressure on the oil pan, that's what is being vented.