All the FAQ info I could find on oil reset procedure call for the pressing of BOTH "select" and "adjust" while turning on the key. This DOES NOT WORK on the 2013. To reset the oil change light you only hold the "select" button while turning on the key. If this has been discussed before...sorry for the repost.
(Still trying to figure out the interval setting)
EDIT: Oops...found the PREVIOUS thread... http://burgmanusa.com/forums/15-burgman-650/51130-oil-change-indicator.html
In the new 2013 650L3 manual... Page 3-16