Which of the following is a benefit of using synthetic oil in motorcycles?

Answer: B — Better thermal stability and improved lubrication

Using synthetic oil in motorcycles provides better thermal stability and improved lubrication, which is a significant advantage over conventional oils. Synthetic oils are engineered to maintain their viscosity and performance across a broader temperature range. This means that they can withstand higher operating temperatures without breaking down, reducing the risk of engine wear and improving overall engine longevity. Furthermore, synthetic oils provide superior fluidity, which enhances lubrication properties and helps to create a better protective film on engine components. In contrast, while other options may suggest some characteristics of synthetic oils, they do not fully encapsulate the fundamental benefits that synthetic oil offers. For instance, the mention of greater costs can be misleading if not balanced by the performance and longevity advantages that synthetic oils deliver, making the initial expense worth it. The aspect of lower viscosity and higher pressure typically refers to specific formulations rather than a general characteristic of synthetic oils compared to conventional oils. Therefore, option B succinctly highlights the primary benefits of synthetic oil, distinguishing it as the correct choice.