1. Generally, pure northern hickory oil is preferred, but it is not easy to buy. If you can't buy it, you can buy pecans yourself, break the peach shell and take out pure peach kernels, and directly roll the oil.
2. If there is no walnut oil, you can use good quality olive oil instead.
3. Some players choose silicone oil with less impurities, but it is not as good as the first two. Cooking oil (sesame oil, Chili oil) is not recommended, because cooking oil will make walnuts very greasy.
Second, the refueling method is as follows:
1, take pecan oil by yourself (economically feasible): break a pecan, take out the walnut kernel (without skin), crush it by hand, directly wipe the oil on your fingers on the walnut without residue, and then brush the oil evenly with a toothbrush.
2. Use bottled walnut oil: Don't oil walnuts directly, first put a little oil on your palm, slice the oil drops, and then brush the walnuts with a toothbrush. This is to control less oiling!