The EGR was canceled by placing a blind sheet of sheet metal so I rule out that the problem comes on that side, I will try to verify the injection model.
The strange thing is that it is not continuous, another issue that I have noticed is that with the Euro Diesel I do not see moisting, at least from within the car, past days I went to Chile where Euro 4 diesel is not achieved and in a long descent the smoke that came out through the escape was impressive, it veiled it by the mirror, but then in Argentina and already working with euro, the problem disappeared despite the long descent of the mountain range, it really is a mystery. The other issue is that in the concessionaire they tell me that it is not necessary to use Euro diesel, it can work with common diesel, but smoke appears.
It has 57,000 km, I do not think it is a valve problem, it is difficult that with such little mileage it has problems with the valve setting, really a mystery.
But I worry that it is a drip of injectors, because that would be washing the cylinders and of course a premature wear of them.