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Old 05-10-2012, 06:24 AM
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Multi viscosity oil question

On 2 guys garage on TV they said that 10W30 oil is thin like 10W when cold and heavy like 30WT when hot. I've never heard this before----anyone else???

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Old 05-10-2012, 06:31 AM
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What they mean is, it won't get any thicker than 10 when cold or thinner than 30 when hot. It still thins out plenty as you know.

John L
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Old 05-10-2012, 09:50 AM
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5W30, 10W30,10w40-whatever the first number is, is the base weight-what they Oil Manufacturers use is called Viscosity Index Improvers (which are generally polymers)-here is a little bit on the subject:
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