Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
Did you change anything else other than the oil? The air filter maybe?
Your best bet is to have the vehicle scanned to see what system might be triggering the light. Do you have access to a scan tool?
If it's not flashing then it's probably just a little hic-up. Something maybe got disconnected during the oil change. Should be ok to drive.
There are a number of wires, sensors, and vacuum lines that will trigger a check engine light if bumped, but their main function is to control emissions. They don't have much affect on the driveablility of the vehicle.
Let me know what codes come up and we'll go from there to figure out what's setting that light.