I notice that the oil life monitor in my 2011 Cruze started reducing the mileage between recommended oil changes. Up till recently, it used to show 50% oil life remaining after 9,000km but right after it hit 250k it started showing 50% at only 6,000km (I've always changed it at 50%). My driving habits haven't changed nor has my route or location since I purchased the car. There's always been a bit of seasonal fluctuation but never like this. Does anyone know if the interval is automatically reduced at 250k because of the higher mileage or could it be trying to tell me something?