Changing oil every 1000 hours is what type of maintenance?

• A. Reactive
• B. Run-to-failure
• C. Conditional
• D. Preventative

Answer: (D)

Scheduled preventive maintenance is performing tasks at planned intervals to keep equipment operating and prevent unexpected failures. Changing oil every 1000 hours is a proactive, regular upkeep activity done regardless of current performance to extend engine life and reduce the risk of lubrication-related failures, which helps avoid unplanned downtime.

Reactive maintenance would be doing repairs after something already fails, which leads to more downtime and higher costs. Run-to-failure means operating until the component breaks before fixing it. Conditional maintenance relies on condition data or inspections to decide when to service, not on a fixed schedule.