[TR] Controversial subject...

[Geo Hahn]

The rebuilder of my OD (John Esposito) recommended (at the time at least)
non-detergent straight 30W -- so that is what I used during the warranty
period.

Sometime after that I went with Redline MT90.

Can't say what is best, just what I did.

Geo


On Tue, Mar 25, 2014 at 12:39 PM, Jeff Scarbrough <fishplate at gmail.com>wrote:

> At the risk of opening up a can of worms, or beating a dead horse...
>
> In my new overdrive transmission, I plan to run Brad Penn GL-4 80W90
>
> http://www.penngrade1.com/Products/Gear-Lubricants/GL4-SAE-80W90.aspx
>
> as directed by British Leyland since the car was new.  The rebuilder
> of my overdrive unit says I should use 30-weight non-detergent oil.
>
> I understand that the weight of motor oil is measured differently than
> the weight of gear oil, and that there isn't a whole lot of difference
> in the viscosity of these oils.  Looking at the specs, I see that the
> 80W90 has a viscosity of 15 cSt at 100C, while the 30 weight break-in
> oil is 11.3, and the 20W50 motor oil is 20.0.
>
> I read all sorts of stories about pressures locking parts together,
> etc., and I wonder if I am over-thinking this...
>
> Jeff Scarbrough
> Corrosion Acres, Ga.
>
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