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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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I know it refers to weight or viscosity but what is the scale? Is 10 more viscos than 0? Why are there 2 numbers, cold engine/hot engine? Is the first number what the engine sees when the oil is cool at start-up?






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posted by  C  on Sat Nov 9 16:06 CST 2002 >


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