I am betting you did not do the reset "dance" at the time of the change.

You have to reset the OCI whenever the oil is changed even if you did the change without having seen the light. Since the light came on shortly after you did a change, it seems you did the change "right on time" for your driving style.

Pushrod described the reset-dance above. I believe the driver's door must be shut while doing the dance.

However, if you did the reset correctly and then the OCI light came on 200 miles later, that would seem like a problem. Is that the case?

 

... I wub my +100k 2007 bare bones X.