Depending on your vehicle make and model, the factory guidelines may vary for when you should bring your vehicle in for major or minor service. The difference between major and minor service is big. To make sure, you should check the car handbook for what is involved in each service. Typically, minor services are generally performed at 10,000, 15,000, 20,000 and 25,000 Kilometers while major services are performed at 30,000, 60,000 and 90,000 Kilometer intervals. Changing engine oil and filter/s is always a necessary service on both major and minor service intervals.