Mango is after your car being factory fresh, but most can't really do that.
1/2 qt. loss of oil over 7K miles is fine. Better than most I'd wager...and I'd be right.
But, you can do other stuff on the car. Find any leaks you have by cleaning up engine well and look for leaks with good led flashlight with around 100 lumens or so. Then realoem.com for every Part Number you'll ever need.
tis.Spaghettidecoder.org will get you bmw tis's.
Tell us more about the car and we'll give you other places to spend money and time...like belts, pulleys, cooling system stuff like therm, ET, wp...maybe a few hoses. Mango will be upset you're not rebuilding your engine, but you can appease him by at least replacing some cooling system parts!