Change oil soon (& then some)

[Programmer]

You're right Shannen--it's a thermal issue. The other
is under computer models, the reduced oil viscosity
pumps easier and "theoretically" provides better
fuel economy--less pump HP parasitic losses.

Lyndon.
----- Original Message -----
From: Shannen Durphey <shannen at grolen.com>
To: <gmecm at diy-efi.org>
Sent: Tuesday, May 29, 2001 8:24 PM
Subject: Re: Change oil soon (& then some)


> AFAIK, remembered from a discussion in a training class,
> this is the answer.
>
> Better grades of oil have allowed reduced engine clearance
> specs.  In turn, reduced engine clearances require "thinner"
> oil.  Oil of too high viscosity can cause the bearings to
> burn out.  I don't know whether it's th inability of the oil
> to carry heat away fast enough, or the inability of th oil
> to provide adequate lubrication.
>
> This can also happen in aluminum manual transmission
> gearboxes when the required ATF has been unknowingly
> replaced with traditional gear oil.
>
> Shannen
>
> Bob Wooten wrote:
> >
> > Thanks to all.  I just changed the oil & when I went to check the manual
> > (yes I am one of those who do read the parts that are important to me),
to
> > see how much oil it was going to take there were about 600 warnings to
use
> > only 10-30 (or 0-30 for those of you in the colder places) Motor oil &
to
> > "NOT USE OTHER GRADES SUCH AS 20-50".  What gives?  am I so out to lunch
> > that I have missed something in motor oil technology?  Mind you this was
a
> > 20 year step up for me (had a 78 Turbo Regal), so now you know where I
am
> > coming from.
> >
> > Thanks again
> > BW
> >
> --------------------------------------------------------------------------
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