My coolant light came on at 7k miles, first cold morning of the year basically and my car was parked on a slight angle.
It took not even a few oz. I have a feeling if I drove around for a bit, the light would have turned off.
But it's not unusual to get a coolant light in a 335i.
Enjoy the car.
2011 BMW 335i E92, 6MT, Le Mans blue - Quaife LSD, JRZ RS Pro, JRZ camber plates, Eibach ERS, full M3 susp, custom toe arms, Powergrid end-links, SS brake lines, brake ducting, Michelin PSS, UUC SSK, ETS FMIC, ER CP, Perf. Exhaust, VAC RSIK, Sparcos; work by VAC Motorsports in Philadelphia