Why I keep doing this is beyond me ... just keep asking for it.
ALL lubricants have a shelf life, those lubricants for late applications being more critical.
Quote:
All manufacturers of lubricants for car components usually indicate date of manufacture and expiring date on the container/package for a reason! Commonly, the shelf life of transmission fluids does not exceed more than 5 years from the date of manufacture. However, this period is specified for tightly closed and sealed (and stored under recommended conditions) products.
Fluid manufacturers say that their products can be stored at temperatures between +10 and +25 ºC. Higher temperatures can lead to premature oxidizing processes. Temperatures below recommended limit may cause fall-outs of precipitation and appearance of deposits. In case, when the container with transmission fluid is opened, the storage room is wet or unheated, there is a strong fluctuation in temperatures, thus transmission fluid may lose its properties before its time (change in viscosity, oxidizing, etc.)
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SOURCE -
https://go4trans.com/technical-trans...mission-fluid/
Late trans are sealed for a reason, they are electronic. Solenoids are subject to damage if exposed to outside air. The manufacturer(s) does not want the owner to be pulling a stick exposing the trans to air and dirt while under drive-train warranty.
Fluid level and quality can be checked by other methods.
You use the manufacturers called-out fluid (or it's correctly called out replacement) that the manufacturer calls for or if rebuilt, what the kit manufacture calls for (and get that in writing).
There is no multi-vehicle motor oil/ATF/coolant and there is no 20,000 mile oil change.
BTW - Plastic containers are porous. Over time, atmosphere will enter the sealed bottle. You open a container of brake fluid, not use all of it and sit it on the shelf, it is compromised.
When you shop parts or lubricants, you choose the recommended
quality replacement. Then you shop price.