Hour Meter for Generator-I think I have your answer!
Ray (and others who had a similar question),
This is my first time posting to Forest River Forums. I'm the owner of a 2012 Forester 3121ds. I had the same issue and am providing you with what I've learned.
"At the first 20 hour mark (break-in) the display will flash (CHG OIL) for 1-second and reoccur every 4 seconds for 4 hours. This sequence will happen 2 hours before and 2 hours after. CHG OIL service will be repeated every 100 hours."
Please also see the attached ENM Technical Data Sheet for more specifics. If this has been helpful, please let me know!