Engine oil should be changed according to what guidance?

• A. After every trip
• B. Only when the oil is dark
• C. According to the maintenance schedule in your owner's manual
• D. Whenever you feel like it

Answer: (C)

Maintenance schedules set by the manufacturer determine when to change engine oil. The owner's manual outlines the recommended intervals because they factor in the oil type (synthetic or conventional), engine design, and typical driving conditions. Sticking to that schedule helps ensure the oil provides proper lubrication, cooling, and sealing, which protects the engine and supports warranty coverage.

Color alone isn’t a reliable indicator of when to change the oil—oil can darken as it does its job without being worn out. Changing oil after every trip wastes resources, and waiting until you “feel like it” leaves the engine without adequate lubrication and increases wear risk. Following the manual’s maintenance schedule is the best approach.