Lubegard Gear Supplement/Biotech differences?

I was wondering, does anyone know if LGs gear supplement is specific to gears or could it be rebranded engine product? I'm asking because I have a couple ounces of Gear supplement left over and have a mower that needs an oil change. I wouldn't mind using it there but of course won't use it if it's a big risk.

I'm reaching out to LG as well, but curious if anyone has any insight on this?