Fluid Temp VS. Transmission Life Expectancy
175°F = 100,000+ miles
190°F = 90,000 miles
210°F = 55,000 miles (Pressure Drops)
230°F = 25,000 miles (Valves Stick)
250°F = 17,000 miles (Varnish Forms)
270°F = 4000 miles (Seals & Clutches Burn)
300°F + = TRANSMISSION FAILURE
Most of the time, they are similar. The best ones are the plate style like this
http://www.summitracing.com/parts/BMM-70274/If you do not run an external cooler, change the fluid at least once a year