Flat tappet lifter failure

[L.Fite]

Originally Posted by Terry Cain

Gotta ask yourself WHY did OEM decide to go to rollers if flats are cheaper to make?

My guess is the change in oil chemistry...

But there is supposed to be remedies for that... (additives)...

So... that begs the question, what is the REAL REASON for the failures?
Self inflicted... (spring pressure)...?
Crappy material/ QC...?
Or some yet unknown quantity...

Inquiring minds would like to know...