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Re: dumb oil weight question
Posted by Dick in Falls Church (more from Dick in Falls Church) on Sun, 1 Jul 2001 18:24:19
In Reply to: dumb oil weight question, bob, Sun, 1 Jul 2001 17:22:53
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It is a question of viscosity, or resistance to flow.
The first part (10W) is the resistance to flow at cold temperature. This is obtained by using a device called a viscometer, which measures how much effort is required to rotate blades in an oil--in this case at -20 degrees C.
The second part is the resistance to flow at 100 degrees C, measured by letting oil flow through a measured hole.
The lower the first number, the less resistance to flow in the cold.
The lower the second number, the faster the oil will flow at high temperatures.
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