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That's a complex question that can't be answered with a simple yes or no. Whether thinner oil ruins an engine depends on several factors, including:

• The specific engine design: Some engines are designed to tolerate thinner oils better than others. Manufacturers' specifications should always be followed.
• The oil's quality and properties: A high-quality thinner oil formulated for a specific engine may provide adequate protection, whereas a low-quality oil, regardless of viscosity, could cause damage.
• Operating conditions: Extreme temperatures or driving styles can put more stress on the engine, making it more susceptible to damage regardless of oil viscosity.
• The oil's intended use: Thinner oils are sometimes used for specific purposes (e.g., improving fuel economy in newer engines), and using the wrong viscosity can cause problems.

In short, using thinner oil than recommended by the manufacturer can potentially lead to engine damage, but it's not a guaranteed outcome. Always consult your vehicle's owner's manual for the recommended oil viscosity.