Look at that! Your money bowl is awesome, @underwaxingmoon. Congrats on making your first one! 
There’s nothing wrong with adding/enhancing your money bowl over time, kind of like a multi-day spell (like the 7 day green candle spell). Every time you tend the bowl, adding things or feeing it energy, it gets stronger (at least in my experience!). I’d say to check in with your bowl in a day or two and see if it needs a boost. If it feels right, add the oil! 
May your bowl bring you many blessings! 