1994.5 - 1997 7.3L Power Stroke Diesel

why is this?

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Jun 21, 2010 | 08:57 PM

#16

RÖENTGEEP

FOREIGN GURU

Joined: Jul 2006

Posts: 7,655

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From: Celaya, Gto. MX

Club FTE Silver Member

Question

Quote:

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

#17

Brown Falcon

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Joined: Jul 2008

Posts: 11,231

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From: Thomasville, GA

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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