gear oil at oil change

[Magard]

(08-10-2019 )Jorg81 Wrote:  What exactly does the gear oil do? I'm about to do it for my first time but I really don't know what it does, I just see that y'all do it.

It’s a thickener. Gives better hydraulic cushion. Also has additive that where taken out when they changed oil to go with emissions catalysts.