The first reply is probably correct here (sorry, I deleted the message).
The scale used for engine oil is different than the scale used for
gear oil. I have a comparison table somewhere, but I'm not sure where.
I'll try to find it if people really want to see it.
-Jim.
> >From trying to pour straight SAE 40 or 50 wt engine oil and SAE 75 to 90
> >gear lube at similar temps I can testify that the engine oils were a lot
> >more viscous than the gear lubes.
>
> It's been a lot of years since I have been involved with fluid dynamics but
> my recallection of the SAE viscosity measurement system is that it's a
> relative number assigned based on the viscosity at zero degrees F. Also, the
> additive packages in the oil have a dramtic impact on the viscosity as you
> move away form zero degrees. I think if you compare 50 weight motor oil to
> 75 weight gear oil at zero degrees the gear oil would be more viscus.
>
> Dave
--
James A. Babcock, Software Engineer email: james.a.babcock@adn.alcatel.com
Alcatel Data Networks WWW: http://www.adn.alcatel.com
Ashburn, Virginia USA personal web page: http://www.dogwood.com/~jbabcock
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