My car is just over 10 months old and just went over 5k miles. Today it popped up the warning "Service A1 due soon." As I understand it, that is to change the oil but not the filter. That seems backward to me since oil doesn't wear out but just gets dirty. It seems more logical to change the filter every time and oil every other time than vice versa. Or change both together every time. Anyone else doing filter every time and oil every other time? IOW filter every 5k miles and oil every 10k miles?