Users of Genuine Honda ATF-Z1 have found this fluid to turn dark brown and emit a "burnt" odor within a very short period of time, often in 30,000 miles or less, espcially in the V6 applications. As I have previously suspected, the Genuine Honda ATF-Z1's appearance of discoloration and "burnt" smell does not necessairly indicate that the fluid is no longer serviceable, as indicated by this bulletin from an A/T Replacement and Diagnostics bulletin. Mopar ATF+4 exhibits a similar behavior (discoloration and producing an odor), and Chrysler explicitly states in their owner's manual that a color change and odor production does not necessairly indicate the need for a fluid change.
Jay's 62K UOA of the factory fill ATF in his '02 RSX 5-spd AT verifies the color/odor irrelevance:
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