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Discussion Starter #1 (Edited)
The 0W, 5W, 10W, 15W and 20W prefixes found on engine oil containers have always confused people. Those prefixes aren't "weights" but rather winter pour point designations in degrees F. In the case of a 0W20 oil it will gravity flow down to 0 degrees F. Likewise a 5W20 oil will gravity flow down to 5 degrees F, a 10W30 oil will gravity flow down to 10 degrees F, and a 20W40 oil will gravity flow down to 20 degrees F. The colder oil gets the thicker it gets so when selecting an engine oil always make sure it's capable of gravity flowing in the lowest temperatures in which it will operate. I just bought six 5-quart containers of Castrol Edge 0W40 full synthetic oil and was amazed over how much thinner it is than the 5W30 oils I have previously been using.
 
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