It is stem seals, Max, on a second gen yes they are known to do this but this is a third gen.....
I have seen a few high mileage third gens to this but have also seen some lower mileage ones using Magnatec oil do this, one in particular with only 140k on it was doing the same thing, we gave it a good engine flush and then used Penrite, 95% of this smoke stopped as did most of the oil consumption
The tube seals will not cause excessive oil useage unles they are so bad they are leaking out of the plug tubes over the top of the motor. The leaking tube seals also will not cause smoke.
I would get some of the Wynns Oil System cleaner, the good workshop grade stuff, and then put it in, idle the engine at least 30 mins (DONT DRIVE IT) and then give it a good hot drain, put some HPR10 in and see how that pans out