Skip on the dealer oil filter or any german filter for that matter. Get the fram CH2930. here is why.
http://24.14.137.240:8080//benz/oilfilter/oilfilter.htm
there is junk inside alot of the oem filters. Ive used only synthetic oils, i like mobil and amsoil as they both use the same base stock to make their synthetic oils.
I have Amsoil 15w40 synthetic in the diesel and mobil 1 5w30 synthetic in the gasser. But its all up to you whether you want to use dino or synthetic.