[SkidmoreGarage]

If you are leaking through your turbo seals, especially into the exhaust, on a new turbo install, check your oil feed restrictor size and the oil drain is big enough and free of kinks.

If oil is building up in the turbo, it will push through the seals and into the exhaust.

I may be reading your post wrong, but I don't see any obvious relation between your problem and the pcv/catch can system. If you were getting oil though a pcv system in the amount required to cause the truck to burn oil out the exhaust, you would see a puddle in your intercooler/piping. This is unlikely.