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What is multi grade oil?

Updated: 12/10/2022
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9y ago

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Multi-Grade or Multi-Weight oil is oil that has additives added to change viscosity of the oil at different temperatures. This allows the oil to flow differently at hot or cold temperatures. This type oil is designated with 2 numbers. The first number is followed by the letter W. The first number indicates the weight of the oil in cold temperatures (Winter). The second number indicates the weight of the oil in normal (hot) temperatures. This multi-weight allows the oil to flow easily when it is cold which protects the engine from excess wear when it is started when it is cold. It then thickens when it is hot to allow for better protection of a hot engine.


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