Originally Posted By: zeng
You've actually found a highly components-protecting manual transmission gear oil in this GL4 Brad Penn 80W-90, in Nissan Maxima or any other manual trans that calls for 80W-90 or SAE90 gear oils.
Depending on your operating circumstances, I would hazard to guess it's operating viscosity would range from 37.4 cSt at light loads to 19.7 cSt at severe loads , delivering thicker oil film thickness/strength for superior components protection than all other gear oils mentioned in this thread.
A typical 75W85 would be operating between 24.4 cSt at light loads and 14.9 cSt at severe loads at weaker oil film thickness , thus weaker components protection generally.
As it's almost free of VII's , this Brad Penn would be very shear stable and may be put into operation at ambients of -26*C(-15*F) and above , more than adequate for Colorado.
Being mineral gear oils should not be an issue if you keep to appropriate OCI.
How did you come to those unsupported conclusions without a thorough analysis?
The Brad Penn gear oil document said nothing about MTF friction modifiers (FMs).
All they do is give the usual B.*S.* about "yellow metals."
The cold temperature specs would result in
increased shifting effort in cold weather.
The Redline
http://www.redlineoil.com/product.aspx?pid=140&pcid=7
provides plenty of anti-wear protection and minimal cold weather shifting effort.
