What Is the Difference between 10w 30 and 10w 40?

Answer

In motoring, 10w 30 and 10w 40 are oil viscosity graders where 10w 30 is thicker than 10w 40. W means that oil viscosity has been tested at a colder temperature and the number without it means the oil has been tested at 100 °C which is the engine operating temperature.
Q&A Related to "What Is the Difference between 10w 30 and 10w..."
15w40 is thicker at all temps vs 10w30.
http://wiki.answers.com/Q/What_is_the_Difference_i...
The numbers in a name like 10W30 refer to an oil's "weight. This is a measurement of the oil's viscosity - how thick it is, and how quickly it moves. Lower weights mean a thinner
http://www.ehow.com/info_7796489_difference-10w30-...
Most cars call for 5W-30 or 10W-30, but if you are in warmer
http://www.chacha.com/question/what-is-the-differe...
The viscosity is different. The 10w is the cold viscosity, 10 being thinner than 20. The second number is the hot viscosity, 30 being thinner than 40. So at cold temps these oils
http://answers.yahoo.com/question/index?qid=200707...
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