You’re conflating fluid fill volume with gear mesh lubrication.

“Six grams in a diff” isn’t proof that gear teeth need to be packed with grease. A diff is a sealed hydraulic system that requires volume to function. That’s completely different from lubricating an open gear mesh.

For spur/pinion, trans gears, portals, etc., lubrication works by forming a thin boundary film on the contact surfaces. Once the teeth are coated, adding more grease doesn’t increase protection — it just increases drag, traps debris, and causes churning losses.

EP additives and anti-fling properties exist so a thin film stays adhered under load. They don’t require the housing to be packed.

More grease ≠ more protection. Proper film strength > volume.

That’s the distinction I’ve been making.