View Here : How Much Is An Oil Change For A Bmw
a 1150 with filter change takes 3.75 litres of oil or 1 american gallon. Start from the beginning, drain oil into clean container, take off the oil filter, check the seal has also come away, replace filter, screw in drain plug with new crush washer, add 3.75 litres/one gallon.
Edit: To clarify, I'm thinking of doing an oil change at 1k, then the next one around 6k or 7k based on how the oil is doing. At a minimum I want to do an oil change twice as often as BMW is suggesting.