Thanks for the asnwers.
The problem that I have is that if I put 4.5 liters and I change the oil filter, then the oil will hardly reach the minimum of the dipstick marks ! So that is because I am puzzled. And the engine is consuming a lot of oil (no leaks, new turbo, rings, valve guides, ...). Is it possible that the oil consumption is because I am using too much oil ?
I have tried to let the oil going down the minimum of the dipstick and never got an oil light warning, nor the engine gets hotter ...
¿?
Thanks again
Nacho