It is generally recommended to apply body lotion first and then body oil.
This method allows the lotion to hydrate and moisturize the skin, with the oil acting as a sealant, locking in those benefits.
For instance, applying oil first may create a barrier, preventing the lotion from fully penetrating the skin. However, you can choose to apply both oil and lotion in whichever order you prefer. There is no definitive right or wrong answer, but the general consensus suggests that lotion first, followed by oil, provides the most effective results.
Important Note: This applies to body oil and lotion. Facial products are generally applied in a different order based on their consistency and purpose.