DO NOT ADD OIL until the pellets have dissolved. You are going to have to warm the solution (note I said 'warm', don't get it too hot) if the pellets are going to dissolve in less than a day or so.
Some put it in the microwave, I just warm up some water in a pot and sit it in there and swirl. If you can't hold onto the vial during the entire warming process, the water is too hot. Remember, the solution doesn't have the oil to shield it from heat, that's why it's so important to not overdo it.