Ford's answers to the NHTSA 6.7 Investigation

BenK wrote:
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Like why did they plug in DLC on both mating surfaces, to then only
plate one surface? Sends a message that their focus is in that spot/area

On DLC, it is NOT a good candidate for lubrication, as diamond is both
the best thermal conductor known to mankind and the best non-stick surface
material known to mankind...lube film strength anyone? On that, diesel
is NOT a good lube to begin with, so using it on the best non-stick
material surface known to mankind is almost an oxymoron

Stay in that rat-hole of DLC and noodle why did they go to this exotic
material that is very expensive (includes secondary and most likely
tertiary processing...maybe more). Why? What were they trying to
solve with that band-aide?

Then why did they remove the coating from one of the mating surfaces?
On that, which one is no longer coated? The cam surface or the follower?

I won't pretend to know all that I should to delve into this but...

Do you think going to DLC on one side just was another in a long line of cost reduction moves?

Would you expect if both were not coated at all there would be improved film strength (such that we'd see longer pump life)? Or would it really matter that much since we're talking about ULSD?

Strange for me to look at that cam and follower, knowing that diesel fuel is flowing in there while I'm accustomed to seeing something more viscous (i.e. engine oil) in that sort of mechanism. But I confess I don't look at pump innards every day.

I'm left wondering if there are other similar applications of cam/followers that have been successful without (what I'd think of as) adequate lubrication...

Anyone know of other Bosch applications of DLC?