Can you use soda to unseize a motor?

Using soda to unseize a motor is not a reliable or effective method. While some people believe that the carbonation in soda might help loosen rust or corrosion, it is unlikely to provide the necessary lubrication or penetrating power needed to free a seized engine. Instead, it's better to use products specifically designed for this purpose, such as penetrating oil or a mixture of oil and diesel fuel, and allow adequate time for them to work. Always consult a professional if you're unsure about the best approach.