Discussion
Which oil property most affects the film thickness?
Answer: D
Elastohydrodynamic film thickness depends on how strongly the viscosity rises with pressure, which is why synthetic oils with a high coefficient give thicker films. Pour point and flash point describe low and high temperature limits. Base number belongs to engine oils. The shared behaviour explains why these belong together and the differences explain why both exist. Tracing the requirement back to the physical constraint that produces it makes the answer follow.
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