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What does the 10W mean in reference to motor oil?

posted by  Steve on  Sun Nov 10 01:50 CST 2002
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last visit: Fri Oct 24 07:16 CST 2014
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A 5W-30 oil has less viscosity (thinner and easier to flow) when cold than a 10W-30 oil, but both have nearly identical viscosity properties when hot. The trend in oil specifications is to reduce overall cold and hot viscosities in order to both improve low-temperature lubrication at startup and to improve fuel economy during hot operation.

Hence, Ford has gone to a 5W-20 oil.






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New What does the 10W mean in reference to motor oil?
posted by  C  on Sat Nov 9 16:06 CST 2002 >


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