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If you are using more than one type of oil, combine them in equal parts to make 3 cups (710ml). Pour the mixture into the top section of a double boiler. Don't add any of the other ingredients yet. If you don't have a double boiler, you can also place a mixing bowl on top of a saucepan. Fill the bottom section of the boiler with 2 inches (5.1cm) of water. Heat on medium heat for about 2-3 minutes until all the oils have combined. Once you've mixed your oils together and heated them in a double boiler, add 112 cups (350ml) of lanolin. Stir the mixture with a wooden spoon until it is well-combined. If you are just using one type of oil, heat up the oil in a double boiler before you mix in the lanolin to help the ingredients combine better. Let your hoof oil sit and cool down to room temperature. Add 1 tablespoon (15ml) each of any essential oils you would like to use. Pour in 1 tablespoon (15ml) of Vitamin E oil as well, if you would like to give the oil extra preservative powers. You can also add glycerin or aloe vera gel at this time, if you are using them. Use something that you can easily dip a brush into when you are ready to apply the oil. Be sure you can fully close and seal the container to protect and preserve the hoof oil when you aren't using it. Try cleaning out an old butter tub to store your oil. You can use a funnel to help you pour the solution without spilling.
Pour your oils into the top section of a double boiler. Heat the oils for 2-3 minutes. Mix lanolin into the warm oil if you're adding some to your hoof oil. Add any extra ingredients after the mixture has cooled. Pour the finished hoof oil into an airtight container.