What Is the Most Common Cause of Car Engine Failure?

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The most common cause of car engine failure is inadequate lubrication, typically from running low on oil or neglecting oil changes. Engine oil creates a protective film between moving metal parts. Without proper lubrication, bearings, pistons, and crankshafts grind against each other, generating extreme heat and friction that quickly destroys components. Overheating ranks as the second leading cause, often from coolant leaks, failed water pumps, or stuck thermostats. Follow the 30-60-90 maintenance rule to prevent these issues. Learn to recognize signs of engine problems early, and understand what can be mistaken for a bad engine. Read our guide on early warning signs your engine is going bad.