Which outcome is most likely if you repeatedly rev the engine before shutdown?

• A. Quicker shutdown
• B. Internal engine damage
• C. Improved engine life
• D. No effect

Answer: (B)

Revving the engine before shutdown puts extra stress on the engine at a moment when lubrication is breaking down as the engine powers down. When you shut off the ignition, oil pressure drops quickly, but the engine is still turning fast if you’ve been revving it. That thin or diminishing lubrication film isn’t enough to protect moving parts at high speed, so metal-to-metal contact can occur more easily. Repeating this puts repeated strain on bearings, piston rings, and the valve train, increasing wear and the risk of damage over time. It won’t make shutdown faster or improve engine life; it simply raises the chance of internal engine damage.