Hi Yannick,
if the pistons in cour cylinders are not broken, have a look at your crankase ventilation system. There are three tubes ( one in front of the engine, one on the top and the last one in the backside).
If they are broken, you may have a high oil consumption in some cases.
This informations i get here int he forum, i never had these problems.Maybe it will help you.
Bye Bernd

In diesem Sinne Gruß Bernd