pre faceleift, heres the thread if you care
https://www.pakwheels.com/forums/members-member-rides/242670-my-first-mercedes-c-class-w203-2
it also has the cost of the oil change mentioned along with other stuff
it either driven within the driveway of my house once or twice a week where you can get it upto 50km/h or a blast down lahore ring road once a month. and a out of city trip on motorway if any and its this car turn, so the driving around the driveway is what causes the oil to require changing more often.
till date i have never used it to go from A to B just for fun and for any maintaince if required.
i use 0W-40 in corolla gli as well and follow 7k drain interval as its 150,000km driven, it spends a lot of time idling especially minimum 50 minutes a day just in waiting and idling outside home, study etc