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ATF Thermal Degradation Estimate

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Old May 18, 2026 | 01:49 AM
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Nikonfan
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Default ATF Thermal Degradation Estimate

I just did an ATF drain and fill, and in a week or so I'll be dropping the pan, replacing the strainer, and of course adding more new ATF fluid.
I plan to do additional drain and fills to get the ATF fluid mostly new.

While reading about the procedures I discovered the manual calls for a reset of the "ATF Thermal Degradation Estimate" when 50% or more of the ATF fluid is replaced.

How critical is it that this be done? I read somewhere that it can affect the shifting parameters.

Is there a way to reset this without Techstream or an expensive OBD scanner?
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