Originally Posted By: HTSS_TR
No, you can change oil at anytime and reset the MM without problems. It starts the new count down as soon as you reset it.
It doesn't get "confused," but when you do an early reset other codes may appear during the confirmation window, such as the "2" or "3" subcodes for filters and trans fluid, respectively. By doing any early reset, it is OK as long as the person who does the rest notes what codes appear and performs those services at the time of the reset. Otherwise, the computer will think that the services were performed even if they were not. This is a serious problem for those who are reliant on the Maintenance Minder system but have their vehicles serviced by independent shops who do not understand or care about the meanings of those subcodes.