Amsoil's 100% Automatic Transmission Fluid

How cold temperature affect transmission efficiencies

OBJECTIVE:

To demonstrate that AMSOIL Synthetic Universal

ATF has excellent low temperature properties

such as a low Brookfield Viscosity and pour

point, which provides higher automatic transmission

efficiencies at low temperatures than conventional

automatic transmission fluid.

ISSUES:

The use of conventional automatic transmission

fluid at low temperatures has always meant slow

transmission shifting, sluggish operation, and

frustration. This brings to our attention the benefits

of AMSOIL Synthetic Universal ATF at low

temperatures.

TECHNICAL DISCUSSION:

Transmission fluid viscosity has a tremendous

effect on the mechanical efficiency of an automatic

transmission. During the transfer of power

in the transmission, over 40% of the total energy

losses are due to the transmission pumping automatic

transmission fluid to the working components

of the transmission. Tests (reference 1)

relating to torque losses associated with pumping

automatic transmission fluid at different temperatures

have shown that a temperature rise of 150°F

can increase the mechanical efficiency in an

automatic transmission by as much as 37.5%.

This data means that increases in mechanical efficiencies

are directly caused by thinner oil

(lower viscosity). When ambient temperatures

drop; the fluid gets thicker, and transmission efficiencies

decrease which greatly reduces effective

useful power and efficiency of the transmission.

Automatic transmission fluid is an important

component in an automatic transmission.

Fiber plates contact metal plates, bearings contact bearing

races, gears contact gears, and automatic

transmission fluid comes in contact and lubricates

all of them. Cold temperatures can cause

conventional automatic transmission fluids to increase

in viscosity, causing a decrease in automatic

transmission efficiency. This efficiency decrease

is often referred to as sluggish operation;

which demands more energy from the engine to

actuate all the parts that come into contact with

the automatic transmission fluid.

Synthetic oils that are not affected by temperature reductions as

much as conventional oils will have better low

temperature pumpability and therefore better mechanical

efficiency. Better efficiency can provide

better fuel economy.

AMSOIL Synthetic Universal Automatic Transmission

Fluid has a lower pour point,

and is pumpable at much lower temperatures than

conventional automatic transmission fluids as

demonstrated by the Brookfield Viscosity Test

it is capable of providing greater

transmission efficiencies and better fuel economy

at low temperatures than conventional automatic

transmission fluids.