Discussion
Which condition promotes scuffing of gear teeth?
Answer: A
When the film cannot separate the surfaces they weld locally and tear, producing the radial scratches characteristic of scuffing. Extreme pressure additives exist to prevent it. High temperature and heavy load are the promoting conditions. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming what changes and what stays the same is the reliable route through questions of this shape.
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