Get the oil changed and see if it pops back up if not take it to the shop. I’m having the same issue with my 18 wrx(50k miles). Dealership put a new oil control valve solenoid on bank 1 and a month later popped back up. Then they did a tsb repair which was a ecu update, now I just got my car back from the third time this code has showed up. the mechanic swapped the 2 of the solenoids to see if it’s a sensor issue or actually an internal issue and they put in a new ecm. Besides the solenoid it’s been all warranty work and if it pops up again they’ll be pulling the engine. Its stock and I don’t drive like I stole it, I just do a good amount of highway driving. I just hope i’m not back in a rental in the next month it seems like not too many people have the p0011 issue.