Yes. Knowing the fluid temperature will change the transmission operation/shift schedule to enhance quick warm-up or to speed the rapid cooling of the fluid when desirable. Most recent vehicles have an ATF temperature (over-temp) warning light: transmission_temperature_warning.gif There is also a 'worn-out ATF' fault code (P0897) for when the fluid 'deteriorates' beyond a certain point: http://www.autocodes.com/p0897_chrysler.html Having software that can help extend transmission life and alert you to operational situations and maintenance needs is a big plus. In most cases the automatic transmission/transaxle should last the life of the car. 15 or 20 years ago this may not have been the case.