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why is this?

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Old Jun 21, 2010 | 08:57 PM
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RÖENTGEEP
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From: Celaya, Gto. MX
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Question
Originally Posted by Brown Falcon
engine oil actually gets thicker as it heats up.

15w40 is 15 weight when cold and 40 weight when warm
Brownie Are you sure of this ? Because acording to this table the cinematic viscocity is less when warm:
 
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Old Jun 22, 2010 | 05:47 AM
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Brown Falcon
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It's what I've heard from several sources. That's why you get easier starts on cold mornings with a 5w40 oil than you do with a 15w40.
 
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