[TR] Controversial subject...

[thenicholls at verizon.net]

 Your over-thinking it.  I migrated from Castrol to Brad Penn motor oil over the whole ZDDP cluster, and if it does or does not make a difference, I sleep better at night.


Its you vehicle, do what you want.


Craig
72 Triumph TR6
 
 
On 03/25/14, 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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