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Update:
I had an inspection camera in the cylinders today, but I didn't see any damage. One of the plugs had a little bit of ash though. I'm guessing that's the cylinder with a leaking injector.
I also added some fresh oil and some oil additive, no result yet but I didn't drive that far.
I almost feel like the smoke got worse when I tapped the PCV ports in the head, but I don't see how since I'm just venting everything to atmosphere. There is no pressure from the oil cap (at least not on idle).
I also noticed that there is no smoke when reving in neutral, there is only smoke after driving and coming to a stop (or just lifting the pedal). The smoke then disappears after idling for about one minute.
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