Function of lubrication in I.C. engines Beyond reducing friction, does lubrication also help dissipate the heat generated at moving interfaces in an internal combustion engine?

Introduction / Context:
Lubrication has multiple roles in engines: friction reduction, wear control, sealing, corrosion inhibition, and heat removal. Appreciating the thermal function clarifies why oil circuits include coolers and why viscosity and flow rate are carefully controlled.

Given Data / Assumptions:

• Hydrodynamic and mixed lubrication regimes present in bearings and piston–cylinder interfaces.
• Pressurized oil circulation with sump or dry-sump designs.
• Heat generated by friction and by proximity to hot combustion surfaces must be removed.

Concept / Approach:

The oil film carries heat away from loaded surfaces (bearings, pistons, valve trains) and transports it to the sump and oil cooler. Thus, lubrication does dissipate frictional heat, in addition to reducing its generation by lowering the friction coefficient.

Step-by-Step Solution:

Verification / Alternative check:

Oil temperature rise across bearings and the presence of dedicated oil coolers on many engines confirm a heat-transport function.

Why Other Options Are Wrong:

Thermal removal is not restricted to air-cooled engines, synthetic oils, or low speeds; it is universal in pressurized lubrication systems.

Common Pitfalls:

Underestimating the importance of oil flow rate; insufficient flow increases bearing temperatures and reduces film thickness.

Final Answer:

True