Red Seal Automotive Service Technician Practice Exam

What is the primary difference between synthetic and conventional motor oil?

1. Synthetic oil is derived from animal fats

2. Synthetic oil is man-made for improved performance

3. Conventional oil lasts longer than synthetic oil

4. Synthetic oil is thicker than conventional oil

The correct answer is: Synthetic oil is man-made for improved performance

The primary difference between synthetic and conventional motor oil lies in the method of production and the resulting performance characteristics. Synthetic oil is specifically engineered through chemical processes to tailor its properties for superior performance, such as better fluidity at low temperatures, higher resistance to viscosity breakdown at high temperatures, and improved overall lubrication qualities. This advanced formulation allows synthetic oils to provide enhanced engine protection, performance, and longevity compared to conventional oils, which are derived from refining crude oil and may contain impurities. Conventional oil does not offer the same level of refinement and laboratory optimization as synthetic oil, which can lead to differences in effectiveness under varying operating conditions and engine demands. Therefore, the emphasis on the man-made aspect of synthetic oil underlines its engineered benefits, making it a preferred choice for many modern engines.