Post by
szh »
https://forums.nicoclub.com/szh-u149.html
Wed May 07, 2008 2:56 pm
Here, by the way, is some info that is important to keep in mind.
Automatic Transmission Fluid Oxidation
Automatic transmission fluid will provide 80,000 miles of service before oxidation occurs under normal operating temperatures of about 174°F. Above normal operating temperatures, the oxidation rate doubles (useful life of fluid is cut in half) with each 20° increase in temperature.
The approximate life expectancy at various temperatures is as follows:174°F 80,000 miles 195°F 50,000 miles 212°F 25,000 miles 235°F 12,000 miles 255°F 6,250 miles 275°F 3,000 miles 295°F 1,500 miles 315°F 750 miles 335°F 325 miles 355°F 160 miles 375°F 80 miles 390°F 40 miles 415°F Less than 30 minutes
This information clearly shows why transmission oil coolers and the various maintenance intervals are recommended for non ideal usage.
Above 270°F, the metals inside the transmission will warp and distort in varying degrees depending on the severity of overheat. Because this damage occurs and fluid life is so seriously impaired, rocking out of snow, mud or sand should never exceed a very few minutes.
Personally, I like to do a full transmission flush every 30,000 miles, so I am assured that it has the best conditions to operate under. Cheap insurance to extend the life of the transmission and avoid expensive replacements!
Z