I have never done a turkey in my Miele CSO but if you go to the Master Chef/Meat/Poultry - you will find a gourmet turkey program. If gives you some instructions as to shelf level/grease filter etc. It also instructs you to fill the water resevoir with fresh tap water so it obviously incorporates the combi steam mode, Hopefully someone with experience can help here. Look at Page 60 in your user manual (at least the one that I could download for your model). The auto roast is a mode on the 30” M series oven.