Is Wine A Mincha?

In this week’s parsha we learn about the obligation to bring libations together with a korban.  The libation offering consists of bringing a mincha of oil and flour combined plus wine which was poured through the holes on the mizbaoch.  One has the ability to offer a nedavah of the מנחת נסכים as well.  Rashi in Menachos 104b explains in such a situation the one offering the korban brings the oil, flour and wine of a מנחת נסכים.  The Rambam in מעשה קרבנות beginning of ch. 2 says היין והסולת שמביאין עם הקרבן הם הנקראין נסכים והסולת לבדה נקראת מנחת נסכים.  The Rambam in Ch. 14 Law 1 says ומתנדב או נודר מנחה ממנחת נסכים לבדה מאי זה מין משלשה מיני מנחות נסכים כמו שביארנו (meaning one can bring the libation mincha of either the sheep, goat or cow that have different amounts.)  If one does the math and adds 1+1 together, it comes out that according to the Rambam when one volunteers a מנחת נסכים  they bring the flour and oil (the meforshim say סולת  includes the oil as well,) not the wine for the wine is called נסכים but not מנחת נסכים.  It comes out according to Rashi we view the obligation of the wine that accompanies the mincha as part of the mincha, but according to the Rambam its viewed as an independent obligation. (See more about this in the Briskor Rav Menachos 44b, Nitziv in footnote to Sifri, Mikdash Dovid siman 10.)