I wish I was wrong but when you smell the smell of burn oil. You can tell it gear oil. Plus when I take the drums off they are black and smell like burnt oil. Although the pictures don’t show it you can see seepage of liquid coming from the bolt in plate.
The smell of burning brake are far different when you add gear oil. If my brakes were adjusting out and burn off brakes. When I let off on the gas and coast I would feel it and slow down fast or faster then normal. She coasts nicely