Instead: Hydrate with H2O. One of the best measures you can take to avoid kidney stones is to drink plenty of water, leading you to urinate a lot. So, be sure to keep well hydrated, especially when engaging in exercise or activities that cause a lot of sweating. It's Not Just the Oxalate.
You didn't say what year or model BMW. The service intervals vary a huge amount between models a years. BMW built since the mid-1980s have a service indicator. You should change the oil when the service indicator tells you to. On BMWs that specify synthetic oil, you should change the oil when the indicator counts down to zero or once a year whichever comes first.
In UK it seems to be most often recommended that oil and oil filter get changed every 10,000 miles or every 12 months, with optional changes between those times. Depending on what car you have, it's possible for even a total noobie to do interim oil and filter servicing, quickly and with a lot of ease.