The importance of this is just as important as the rest of your cars cooling system for without it you will cause a lot of damage to vital engine components.

TRANSMISSION OIL COOLING

Automatic transmissions generate large amounts of heat and are totally dependent on the transmission fluid for cooling.

When the fluid temperature exceeds 93°C the fluid deteriorates rapidly, diminishing its ability to lubricate and cool critical valves, springs, seals and other internal components, leading to premature failure and costly repairs.

Over 90% of all automatic transmission failures are caused by overheating. A 10% drop in fluid temperature can double the life of the transmission!

ENGINE OIL COOLING

Almost one third of the heat generated by the engine must be removed by the vehicle's two cooling systems. That's correct your engine has two cooling systems.

The top of the engine: the area around each cylinder in the engine block, the combustion chamber areas in the cylinder heads and the intake manifold, dispel heat through the engine's radiator coolant system. The rest of the engine: the crankshaft, bearings, camshaft, lifters, connecting rods and pistons are only cooled by engine oil.

The ideal operating range for engine oil is 82°C through 93°C. While operating within this range, the oil works as a lubricant, coolant, and cleansing agent in the engine.

Modern engines generally run with radiator coolant temperatures between 90°C and 105°C with oil temperature ranges up to 25°C hotter. In other words, when the engine is performing flawlessly, the engine oil is already overheating. Oil that exceeds 105°C rapidly loses its ability to lubricate and cool causing accelerated fatigue and premature component failure.