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There should be no appreciable level of CC pressure sitting at idle, with VTA or a sealed PCV system. Unless you have BIG engine problems, or something with the PCV system is improperly plumbed.
Although, that vid shows what looks like oil on external surfaces of the turbine? Could it have been spilled and under a heat shield? Might just take some time to burn off. Or, remove the shielding and inspect/clean. Could be a loose supply line or fitting too.
Would be nice to see a diagram and pics of how the catch can is set up. IMO, a sealed PCV system (stock or aftermarket) is much more beneficial than VTA, regardless of boost/power.
Best practices for turbo drain/plumbing...
-The drain port/lines need to be AT LEAST as big as the drain port on the turbo.
-Drain line should ONLY go downward, with no horizontal routing (unless scavenge pump is used).
-Drain line into the engine/sump should be above the oil level when the car is idling.
-Turbo sump must be vented to the engine's PCV system. If it's not, you can absolutely push oil past the turbo seals under some conditions, but there would be no external smoke at idle.
- If the turbo is low and using a scavenge pump, a 1psi check valve to prevent overfilling the turbo CHRA after shutdown.
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