I have mixed feelings on both. Is there a certain level of taps you should be at before you use oil, or does oil seem to be more efficient at all stages? I am confused as to which way to go at this point. I have leaned towards oil, but recently spoke with someone that had me second guessing. Any advise will be greatly appreciated. I am looking to purchase my evaporator most likely after this sugaring season since I anticipate many will go up for sale.