[TR] Controversial subject...

[ptegler]

You have to do what is comfortable in your own mind.
In the end it's your car an you have to deal with the results of what ever 
decision you make.

This might help, this might make the decision a little harder.... but it's 
some general info for everyone I guess.

In my J and D type overdrives in my Triumphs I use the 'book specified' 
Castrol 80-90 Hypoy
But in my LH type overdrive in my BGT, I use(d) the book spec'ed 30wt 
non-detergent oil.
Non have ever given my any issues over thousands of miles.
.... I personally put nearly 160K miles on the BGT o/d without a hiccup, 
that is before the Tremec T-5 5 speed went in behind the V6.
:-)
I've had a d-type go bad, but it was the cone clutch abused by the p.o. with 
poor maintenance. After the rebuild and another 20K miles
with nary a glitch of any kind.

I have to assume (and knowing John personally now) his recommendations are 
based on his years or experience, and the way he sets up the pump and 
pressure relief valving. So as you mentioned, I'd agree...stay with his 
recommendations for the warranty period at the minimum.



Paul Tegler
ptegler at verizon.net
www.teglerizer.com
----- Original Message ----- 
From: "Jeff Scarbrough" <fishplate at gmail.com>
To: <triumphs at autox.team.net>
Sent: Tuesday, March 25, 2014 3:39 PM
Subject: [TR] Controversial subject...


> 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.
>
> ** triumphs at autox.team.net **
>
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