ZDDP in gearoil?

[Newcmr]

Hello

why do most gear oils have no ZDDP or very little of it? how do gear oils still protect against wear?

 

[CharBaby]

Here is an older post.
https://bobistheoilguy.com/forums/threads/why-no-zinc-in-gear-oil.121882/

 

[wwillson]

Take a look at @MolaKule 's excelent whitepapers on gear oils.

https://bobistheoilguy.com/forums/threads/gear-tribology-and-lubrication-part-i.57856/

https://bobistheoilguy.com/forums/threads/gear-tribology-and-lubrication-part-ii.57858/