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| Engineering/ Technical Ask technical questions about cars. Do you know how a car engine works? |
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#1
01-21-2006, 09:46 PM
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Oil grade
Does anyone know what the second rating on engine oil means? 10W-30 for example, 10W means it has thickness rating of 10 when tested at 0 degrees F I believe. The second part means it has the rating of 30 when tested at 212 degrees F if I remember correctly. But Im wondering, engine temperature can go way past 212 degrees, so how does testing and rating oil at 212 degrees mean anything?
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#2
01-22-2006, 01:46 AM
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Re: Oil grade
Engine water temp can get well past 212, but oil usually doesn't get much past 220 degrees, so wherever they rate the oil is more than sufficient.
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