What is meant by friction modifiers when discussing transmission fluids?

What is meant by friction modifiers when discussing transmission fluids?

• A. Additives that increase friction on bearing surfaces
• B. Additives that change the characteristics of the clutch seals
• C. Additives that reduce friction on bearing surfaces
• D. Additives that change the friction characteristics of the clutches

Answer: (D)

Friction modifiers are additives in transmission fluids that adjust how the fluid affects friction between the clutch surfaces. They fine‑tune the grip of the clutch plates so engagement is smooth and torque is transferred reliably without slipping. The goal is to change the clutch friction characteristics, not to alter seals or reduce bearing friction. By adjusting friction under varying temperatures and pressures, these additives improve shift quality and wear protection.

Friction modifiers are additives in transmission fluids that adjust how the fluid affects friction between the clutch surfaces. They fine‑tune the grip of the clutch plates so engagement is smooth and torque is transferred reliably without slipping. The goal is to change the clutch friction characteristics, not to alter seals or reduce bearing friction. By adjusting friction under varying temperatures and pressures, these additives improve shift quality and wear protection.