Home | Mailing
List | Specifications | Care
and Feeding | Modifications | Vendors
| Literature
ATF Temp Chart
from http://www.niehoff.com/techtips/techtipidx.html
new 4/21/01
Automatic Transmission Fluid Oxidation
Automatic transmission fluid will provide 100,000 miles of service before
oxidation occurs under normal operating temperatures of about 170°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:
| 175°F |
|
100,000 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 severe usage.
Above 300°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.
Contact Information