My car has been smoking for over a year now. Got the diagnosis from dealer of stem seals. My car is fine. No loss of power or response, just occasional smoke and embarrassment.
It's pretty frustrating that they can't even be certain of how to repair these issues. My dealer didn't even want discuss it with me as though it was taboo. They probably just dont want to do risky repairs

So I'm just gonna keep topping up the oil till I find out some new info. Oh and my car is practically identical to yours on make and mileage. I wonder whether its an inherent fault of the year of manufacture?