Posted by JDEM on February 10, 2018 at 10:24:51 from (174.230.5.61):
In Reply to: Re: GL1 Debate posted by Rich'sToys on February 10, 2018 at 08:50:36:
GL5 gives the most wear protection. It was designed to protect hypoid gears.
The problems of using in some older equipment are this.
#1 Original formula GL5 was not safe to use where any yellow metal like brass or copper existed. Now you can buy GL5 that is yellow-metal safe.
#2. Some transmissions have wet-brakes that get ruined by GL5 because of the extra additives.
#3. Some manual transmissions require a certain amount of friction on the synchronizer clutches to work right and GL5 is too slippery.
As far as your Deere A goes? GL5 in the correct viscosity is fine if yellow metal safe version. I have no idea if your Deere has any brass in it or not.
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