What would really be ideal here, would be a magnetic drain plug to capture the metal slivers.

In the sixties, there were many Fords with magnetic drain plugs in the rear axles from the factory. I used to get them at the wrecking yard and use them in every transmission and gear box that I had. It was simple because all cars were the same size pipe thread drain plug.

In the case of our MB's I would guess that the only way you would have a magnetic drain plug, would be to make one.

My $0.02,