Gear oil is a lubricant made specifically for transmissions, transfer cases, and
differentials in ... Also, transmissions which explicitly call for GL-4 oil may have
been designed around this lower ...
The Difference between GL-4 and GL-5 gear oils. 2 of 11. A traditional GL-4 gear
oil of any given viscosity has about ½ of the level of sulfur/phosphorous.
Nov 18, 2015 ... When someone tells you that their GL-5 oil covers GL-4, remember they are
correct as far as EP protection,but that is only half answer.
Sep 13, 2011 ... If you go to an auto parts store and look for GL-4, you most likely won't find any.
What you will find is a lot of of GL-5 gear oils that say on the ...
GL-1, Active, The designation API GL-1 denotes lubricants intended for ... API GL-
1 service but below the requirements of lubricants satisfying API GL-4 service. ...
protection from gear scoring in excess of that provided by API GL-5 gear oils.
75W90 GL-4 gear oil (similar to SAE 5W40/10W40 engine oil viscosity); Popular
... in most GL-5 oils that cause damage; High performance gear protection and ...
It makes the very important point that GL-5 is an oil spec rating, NOT a transaxle
spec rating. ... The choice between using GL-4 vs. ... It's simply because I've tried
many gear oils and GL-4 works while the others have caused issues .... Simply
because there is a difference in the formulation and you cannot make the general
Some say to use GL-4 like in the transmission, but others say that GL-5 is O.K.
since ... The problem in the past with some Sulfur EP additive packages in gear
oils and ... The problem is the difference between what is called active and
GL-4 and GL-5 are standards set by the American Petroleum Institute for gear oils
. GL-4 are intended for axles with spiral bevel and hypoid gears operating ...
Apr 3, 2005 ... I've been told that I shouldn't put EP90 GL5 specification oil in the gearboxes
because it will ruin. ... Differences between EP90 GL4 and GL5 ... GL5 gear oil is
a lubricant with very high extreme pressure performance needed ...