Thread: NASA @ VIR, July 25-27
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Old Jun 26, 2008 | 12:10 PM
  #23  
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From: Midlothian
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Default Re: NASA @ VIR, July 25-27
Originally Posted by NismoSE-R
The first number is the weight. So you want 10w(weight)30 rather then 5w30.
Wrong. W stands for winter - the first number is the oil's viscosity in cold temperatures. Second number is viscosity after it gets hot. (200+ degrees.) Therefore if you want a 'thicker' oil for a track car, you most likely want to raise the second number.
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