Which statement correctly describes the primary use of synthetic oil?

Which statement correctly describes the primary use of synthetic oil?

• A. It is used only in piston engines.
• B. It is seldom used in turbine engines.
• C. It is the primary oil for piston engines.
• D. It is the primary oil for turbine engines.

Answer: (D)

Synthetic oil is chosen mainly for turbine engines because they run at higher temperatures and under more severe conditions than many piston engines. The oil needs to resist oxidation, maintain a strong lubricating film, and keep its protective viscosity across a wide temperature range. Synthetic formulations deliver superior thermal stability and longer service life, which is why they are the primary oil used in turbine engines. Piston engines have historically used mineral-based oils, and while synthetic oils can be used there, they are not the standard primary oil for piston engines.

Synthetic oil is chosen mainly for turbine engines because they run at higher temperatures and under more severe conditions than many piston engines. The oil needs to resist oxidation, maintain a strong lubricating film, and keep its protective viscosity across a wide temperature range. Synthetic formulations deliver superior thermal stability and longer service life, which is why they are the primary oil used in turbine engines. Piston engines have historically used mineral-based oils, and while synthetic oils can be used there, they are not the standard primary oil for piston engines.