Begin by setting up your chocolate fountain according to the manufacturer's instructions. Place it on a stable surface to avoid spills.
In a double boiler or microwave-safe bowl, combine the semi-sweet chocolate chips, heavy cream, and vegetable oil. Stir them well.
If using a microwave, heat the mixture in 30-second intervals, stirring after each, until completely melted and smooth. If using a double boiler, stir continuously over simmering water until melted.
Once the chocolate mixture is fully melted and smooth, pour it into the reservoir of the chocolate fountain, following the manufacturer's guidance for amounts.
Turn on the chocolate fountain and allow the chocolate to start flowing. It may take a few minutes to reach the perfect flow.
While the chocolate is melting, prepare your dippers by arranging them on serving platters or bowls.
Once the fountain is flowing, use skewers or toothpicks to dip your chosen treats into the chocolate and enjoy!