I have had mine 3 seasons and changed to oil once but will be changing it again soon. I would recommend at least changing the oil cause that stuff gets beat. If you plan on keeping the bike learn how to change it yourself and buy the oil to do it. If your going to dump the bike soon just pay the $30 or so to have the shop change the oil and inspect the inerds.
You can also get aholt of push industries up in fort fun and they can help you with improvements. I have rode with some of those guys and they seem like decent folk.
PUSH Industries - Welcome to PUSH