The higher the numbers, the heavier/thicker the oil and less ability it has to flow. ... Thus, both oils have the same design viscosity when cold, but the 5W20 thins out more when hot compared to the 5W30. In actuality, because of colloidal properties, the 5W20 is slightly thinner when cold compared to the 5W30 also.
https://www.quora.com/What-is-the-difference-between-5w30-and-5w20-When-should-...
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