Menahot 104: Wine and Oil, Redux

Another 2 mishnayot! 1 - Making donations of libations to the Temple must be made in the specific amount of the offerings themselves, rather than being too much or too little for the one given libation. Which gives rise to the question whether libations need to be in fixed amounts or not. And that answer is elusive. 2 - With regard to bringing oil as its own offering - that doesn't really work, according to Rabbi Akiva, but Rabbi Tarfon says it does work. Why would oil be different from wine in this regard? But they are. Also, some restrictions on one who vows to donate grain-offerings, depending on what he has or has not specified. Plus, the significance of the grain-offering.