You can substitute grapeseed oil for any other oil you have on hand, but I recommend something with a lighter flavor like grapeseed, avocado, or canola oil. You can use olive oil but it will contribute to the flavor of the donuts.
Nutritional information does not include icing. 264 calories with 1 donut with icing 5F/52C/3P.
Oat milk can be substituted with any plant-based milk such as soy milk, almond milk or cashew milk.