Coolant warning flashed few days ago. The message warned of "severe engine damage" if not attended to. Car is almost exactly a year old. Had to top up 1.5 cans of shell coolant. Reservoir Seemed almost empty. Am sending it in for 10k mileage service next week just to be sure. Just wondering if anyone's had a similar experience? FYI, had the same problem the first few months of ownership with my E90. But no issues after that.