Usually every 3000-5000 miles
Time for an oil change.
Mileage or once each year.
You have to change your oil as directed to keep your car from becoming useless.The mileage is secondary.Primarily you want your car to be functional and not scrap metal.
The oil change garage or Mercedes dealer has to reset the oil change light. The oil change light goes by the mileage on the car, tripping the light on at the factory recommended oil change intervals. The computer doesn't know you changed the oil in the car unless you tell it. Read your car owners manual.
every 6000 kms
No it will not. If it is a coupon for a regular oil change, you will not be able to get that special rate on the high mileage oil change.
On your last oil-change service, the service center should have stuck a sticker on your windshield that tells you at what mileage is your next oil change.
you should change oil on you car every 5000 miles
Usually the oil filter of the car is changed when the oil is changed. The oil change should be done on regular bases after like 3000-5000 miles or when the car is brought to the garage for a service.
3 months 3000 miles
Every oil change.
You should change the oil in your car every 3,000 miles if you drive it hard or at least every three months. Your first oil change should follow the general rule but really unless you have driven it really hard, which you shouldn't do to a new car, changing the oil at 5,000 miles would not hurt your car.