When should oil changes be performed on JSO vehicles?

• A. At the next scheduled service after 6 months.
• B. After every 2,000 miles.
• C. Only when the indicator says 50% or higher.
• D. When the vehicle indicates the oil life is 20 percent or lower.

Answer: (D)

Oil life is monitored by a system that estimates how much protective capacity the oil still has based on how you drive and engine conditions. On JSO vehicles, the recommended time to change the oil is when that oil life indicator drops to 20 percent or lower. This threshold is chosen because it corresponds to oil that is beginning to lose effective lubrication and needs fresh oil to protect engine components.

Relying on a fixed schedule (like every 6 months) or a fixed mileage (such as 2,000 miles) ignores how you actually use the vehicle; in easy driving, you could change too soon, and in demanding conditions, you might wait too long. Waiting until the indicator is at 50 percent means oil has degraded more than is ideal, increasing wear risk. The system may also prompt earlier changes in severe conditions, which is exactly what that 20 percent threshold accounts for.