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What does the W stand in W oil?

Updated: 12/10/2022
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7y ago

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If you mean W as in 10W30 motor oil, it stands for Winter. The thickness of those oil changes with the temperature- they are not as thick (viscous) in cold weather, but get thicker as they warm up. Makes it easier to start the engine in cold weather.

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7y ago
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Q: What does the W stand in W oil?
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