Honestly it's hard to tell, I have some tuning issues to sort (it's super rich), so on WOT there is some smoke, but having asked people who have been behind me it is apparently black rather than blue.
A few things in the works, I bought a Kobe intake but need to fab a pipe to connect it to the turbo, that will be a big step to having the tune sorted. I am hoping to fab new intercooler piping too, but I'm unsure how I want to tackle the bpv as I want to keep it plumbed back into the intake.
I am also buying an OPR setup shortly, so even if oiling isn't a huge problem it'll be monitorable and I can rule it out.