Either oil is good, for my money it would be silkolene, engines don't burn oil unless there is a problem, but some forced induction engines like the yb/cossie can use oil, most of this passes past the turbo "seals" and is quite normal to lose a bit here if used very hard.
Cossies don't like thin oils, but as yours is that new you would most likely get away with a 40 weight oil, unless you use it hard in which case use a 50 weight such as the titan.
tabetha