Originally Posted by base2

The internal assembly is a standard part available for almost any bike shop to order. It comes pre-packed & ready for install. But still follow the above linked lubrication tips. It costs nearly as much as a new complete hub. The savings is an avoided wheel build.

The replacement must be from the hub compatibility list.

I suppose the internal hub grease is some variety of lithium grease, the caveat is that standard lithium grease prevents the rollers from adequately grabbing the hub shell for power transfer. The hub will slip. You'll hardly ever go wrong with OEM product. The Phil's is simply in addition to to spread where the other grease doesn't go & for the anti-corrosion additives.

If you are seeing chunks & debris, & have a nearly seized hub, what you have is not a lubrication problem.

Tell your friend this is why you are not supposed to not to power shift IGH hubs. You don't have a clutch. Stop peddling, shift, then resume peddling. The hub should last essentially forever.