Many automakers require owners to use synthetic oils in their cars' engines due to their superior features. Synthetic oils have specific advantages over conventional engine oils. They are designed to be more effective since they:
Have high resistance to oxidation, and therefore can last longer than traditional oils.
Have the ability to withstand high temperatures thus can effectively keep the engine running for a very long time.
Can flow even in cold temperatures, thus significantly reduce engine wear during cold startups.
Learn more about synthetics and their benefits here.