I can't believe this this is happening to me and I also had to add oil to my car like u have I think it might be time for me to upgrade

 

What is the big deal here? Newbies freaking over nothing.
OP- drain the oil and put correct oil in. The car take 6.5 liters of oil with new filter. Use BMW 5w30 or other 5w30 EU formula. You can also use a 0W30 depending on the specs. In U.S.
Cap looks about right for 100-135K mi.
Change oil about evey 7500-8000 mi using fully syn oil.

Adding a little oil to your car is sometimes needed. Especially if you have a small leak somewhere. Adding a 1/2 liter every 4K miles is not uncommon. I don't have this issue but it's not uncommon.
No offense but the last 2 posts sound as if they're panicking. I don't think that's going to get you anywhere