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Answer: SAE stands for the Society of Automotive Engineers, which sets the global standard for classifying oil viscosity (thickness). • 5W (Winter): The "W" stands for Winter. A lower number means the oil flows faster during cold starts, protecting your engine the moment you turn the key. • 40: This indicates the oil's thickness at operating temperature (100°C). A higher number provides a stronger, more stable protective film, which is essential under high heat and heavy loads.