Applesauce (Best Option)
1/4 cup per 1/4 cup vegetable oilApplesauce works well as a substitute because it contains natural pectin and water, which help retain moisture in oatmeal, mimicking the lubricating effect of oil. The mild sweetness complements the oats without overpowering them.
To ensure the best results, use unsweetened applesauce to avoid altering the flavor balance too much. Watch for slightly thinner consistency, which can be adjusted by reducing other liquids slightly.
Compared to vegetable oil, applesauce reduces fat content and adds subtle fruit notes, resulting in a lighter, less greasy oatmeal with a tender mouthfeel.