Using palm oil as a substitute for car engine oil is not recommended. Engine oils are specifically designed and formulated to meet stringent requirements for lubricating and protecting internal combustion engines. They undergo extensive research and development to ensure they provide proper viscosity, thermal stability, corrosion resistance, and wear protection.

Palm oil, while a natural oil, lacks the necessary additives and properties required for optimal engine performance and longevity. Using palm oil as engine oil could lead to various issues such as:

1. Viscosity: Engine oils are designed to maintain consistent viscosity over a wide range of temperatures. Palm oil may not provide the necessary viscosity characteristics for effective lubrication in different engine operating conditions.

2. Additives: Engine oils contain additives to enhance their performance, such as detergents, dispersants, and anti-wear agents. Palm oil does not have these additives in the required concentrations.

3. Thermal Stability: Engine oils must resist thermal breakdown at high temperatures. Palm oil may not possess the same level of thermal stability as specialized engine oils.

4. Corrosion and Oxidation Protection: Engine oils protect against corrosion and oxidation, which are critical for engine components. Palm oil may not offer the same level of protection.

Using an improper lubricant can lead to increased wear, reduced engine efficiency, and even engine damage. It’s essential to use the recommended engine oil specified by the vehicle manufacturer to ensure optimal performance and longevity of the engine.