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Using 10W-40 motor oil instead of 15W-40 in a small engine can be beneficial in colder temperatures, as the lower viscosity at startup allows for better flow and protection. However, in warmer conditions, 15W-40 may provide better protection at higher temperatures due to its thicker viscosity. Always consult the engine manufacturer's specifications to ensure compatibility and optimal performance. Using the wrong oil can lead to increased wear or damage over time.

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2mo ago

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