I was driving home in 30 min of heavy traffic and there was a warning saying stop engine because of low coolant. I was only a 30 seconds away from arriving at so carried on. The oil temp wasn't overly high so I'm guessing the engine wasn't over heating. I checked the coolant and it was under the min level. Is it normal for this engine to loose coolant? I haven't owned a car that's ever required the coolant to be topped up in between services.