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Automatic transmission fluid is made to last for a very long time or even longer, under certain conditions. If the transmission would never get close to the recommended maximum temperature in operation, than there would be no transmission repair shops in San Diego. Heat and friction with low lubrication are most common factor related to transmission problems.
​There are some transmission brands that actually the transmission itself has a small sticker posted right next to the fluid drain plug “ LIFETIME OIL, NO OIL CHANGE”. You can find these type of transmissions in Audi, BMW, MINI Cooper and other foreign models.

That being said, in real life with normal driving ( traffic, freeway, city traffic lights and stop signs) automatic transmission in most cars reach high temperatures and surpass those temperatures on a regular basis. Transmission service or transmission flush should be scheduled every 30k - 40k miles for most vehicles.

“ As a rule of thumb, every 20 degree increase in operating temperature over 175 degrees F. reduces the life of the fluid in half!

At 195 degrees F, for instance, fluid life is reduced to 50,000 miles.

​​At 220 degrees, which is commonly encountered in many transmissions, the fluid is only good for about 25,000 miles.

​At 240 degrees F., the fluid won't go much over 10,000 miles.

​​Add another 20 degrees, and life expectancy drops to 5,000 miles.

​​Go to 295 or 300 degrees F., and 1,000 to 1,500 miles is about all you'll get before the transmission burns up.

If you think this is propaganda put forth by the suppliers of ATF to sell more fluid, think again. According to the Automatic Transmission Rebuilders Association, 90% of ALL transmission failures are caused by overheating. And most of these can be blamed on worn out fluid that should have been replaced. “ source Yahoo Auto

Transmission service or transmission fluid change is recommended every 20,000 to 40,000 miles for most cars. If you drive a pickup truck and often carry a load or tow a trailer, I would recommend to perform transmission service every 20,000 miles and install a transmission cooler as well to protect your “work horse” from failing.
Daily commuters who drive minivans also should consider replacing transmission fluid more often, just because of the larger weight of the vehicle.

On most vehicles, the automatic transmission fluid runs in a loop and is cooled by a small heat exchanger inside the bottom or the side of the radiator. Hot ATF from the transmission circulates through a short transmission lines.

Tests have shown that the typical original equipment manufacturer oil cooler is marginal at best. ATF that enters the radiator cooler at 300 degrees F. leaves at 240 to 270 degrees F., which is only a 10 to 20% drop in temperature, and is nowhere good enough for extended fluid life. Solution for proper transmission cooling is external transmission cooler installed by professionals at San Diego Transmission Shops.

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Transmission Service in San Diego