Well now it depends on which part of the book you choose to read. If for instance we read page 10 in the section on draining the crankcase oil it says ......"Fill the crankcase with 450cc of 10W50 motor oil."
If on the other hand we read page 19 in the specs it still says 450cc however it recomends SAE10W40.
I have a '12 250 and '12 300 Cabby , two books and they both say the same . Hope this clears it up for you