If you want to undo an update, you should use Undo as soon as possible after Oil Change installs the update. Oil Change saves a backup copy of the original version of the software and system settings on your hard drive. However, as you use your computer, system settings change constantly. So, it is advisable to use Undo before the saved system settings become out dated.
If you use Oil Change to automatically install more than one update, Undo can reverse one or more of the automatically installed updates. Oil Change removes the old backup version to make room for a new one according to the schedule that you specify on the Undo tab in the Options feature. This is done to keep the disk space used by Oil Change to a minimum.
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