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From 1958-1968 many vehicle manufacturers continued to use the next GM automatic transmission fluid specification, the Type "A" Suffix "A" fluid, in their transmissions. In 1966, Chrysler began releasing their own automatic transmission fluid specifications; see Mopar ATF for more information. GM ATF was the same color as engine oil through 1967.
DEXRON-VI is of a slightly lower viscosity when new compared to the prior DEXRON fluids (a maximum of 6.4 cSt at 100 °C for DEXRON-VI and 7.5 cSt for DEXRON-III), but the allowed viscosity loss from shearing of the ATF during use is lower for DEXRON-VI, resulting in the same lowest allowed final viscosity for both DEXRON-III and DEXRON-VI (5.5 ...
The fluid specification for Mercon-ULV (Ultra-Low Viscosity) was introduced on January 2, 2014. ... the automatic transmission fluid needs to be serviced after every ...
The viscosity index (VI) is an arbitrary, unit-less measure of a fluid's change in viscosity relative to temperature change. It is mostly used to characterize the viscosity-temperature behavior of lubricating oils. The lower the VI, the more the viscosity is affected by changes in temperature.
It has high viscosity and usually contains organosulfur compounds. Some modern automatic transaxles (integrated transmission and differential) do not use a heavy oil at all but lubricate with the lower viscosity hydraulic fluid, which is available at pressure within the automatic transmission. Gear oils account for about 20% of the lubricant ...
Consequently, if a liquid has dynamic viscosity of n centiPoise, and its density is not too different from that of water, then its kinematic viscosity is around n centiStokes. For gas, the dynamic viscosity is usually in the range of 10 to 20 microPascal-seconds, or 0.01 to 0.02 centiPoise. The density is usually on the order of 0.5 to 5 kg/m^3.
Mazda type M5 ATF has a greater anti-judder specification than Ford Mercon V and Ford Mercon LV. Consequently, carefully refer to the service manual for correct transmission maintenance as Ford and Mazda made their own calibration modification on the transmission so mixing different oils or servicing transmission with the wrong fluid will ...
The proportionality factor is the dynamic viscosity of the fluid, often simply referred to as the viscosity. It is denoted by the Greek letter mu ( μ ). The dynamic viscosity has the dimensions ( m a s s / l e n g t h ) / t i m e {\displaystyle \mathrm {(mass/length)/time} } , therefore resulting in the SI units and the derived units :
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