Originally Posted By: Shannow
Originally Posted By: MolaKule
Any GL-X spec is primarily a gear protection spec.
GL-4 is commonly specified for manual transmission and transaxle gear and bearing protection.
http://www.bobistheoilguy.com/forums/ubb...tion#Post729255
Hey Molakule, could you please comment on these AFTON ways of achieving GL4 ?
Here's a "premium" add pack for transmissions, specifically for GL-4, ZDDP based etc.
http://www.aftonchemical.com/ProductDataSheets/Driveline/HiTEC-353_PDS.pdf
Here are a couple of other products, that are GL5/GL4...
http://www.aftonchemical.com/ProductDataSheets/Driveline/Axcel-S_PDS.pdf
https://www.aftonchemical.com/ProductDataSheets/Driveline/HiTEC-343_PDS.pdf
The GL4 is achieved with the same additive in both cases at half treat rate (which supports an internet myth, but the dedicated GL4 dispells that myth).
I take it if I could choose an oil formulated with the first of the additives, genuine GL4 target, I would have a better manual trans solution than the multipurpose half treat rate examples.
And there's no way of knowing without VOA which direction a bottle on the shelf is made from.
Without
an expensive lab analysis, there is no way to tell exactly what is in there.
A bit of formulating history may explain things a little.
Many years back, the only way to achieve a GL-4 rating was to use either a commercial additive package or mix your own. When I started out, I mixed my own individual components.
As far as commercial additives, the only way to do it back then was to take a sulfur-phosphorus EP gear oil additive package and use a treat rate of 1/3 to 1/2, and use a low treat rate of ZDDP as the primary anti-oxidant, and add the friction modifier.
Later, a special ZDDP-based package was offered with additional anti-oxidants, metal inhibitors, rust inhibitors, emulsifiers, and synchro friction modifiers. The HiTec 353 and the Lubrizol equivalent uses this combo.
Today, we use a special multi-funtional phosphate ester package that contains a powerful aminic-phenolic antioxidant, with added metal inhibitors, rust inhibitors, emulsifiers, and synchro friction modifiers.