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Automatic Transmission Fluid Life

AUTOMATIC TRANSMISSION FLUID LIFE / TEMPERATURE RELATIONSHIP:

Automatic transmission oil can provide up to 100,000 miles of service before oxidation requires replacement, at an operating temperature of 175° F. Above this temperature, the oil oxidation rate doubles with each 20° degrees F increase in oil temperature. See chart.

DEGREES F MILES DEGREES F MILES
175 100,000 295 1,500
195 50,000 315 750
215 25,000 335 325
235 12,500 355 160
255 6,250 375 80
275 3,125 395 40

Note: Transmission oil and filter should always be changed more frequently when driving with heavy loads (RVs), typically at least every 25,000 mile intervals, since converter outlet temperatures then normally far exceed the ideal 175° F.

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