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.
The common suggestion is to change the oil every 3000 miles. And numerous service stations and their mechanics gladly parrot this recommendation. After all, every time you come to change your oil, they will get paid. After every oil change, your windshield or the inside of your cars door is decorated with an oil change sticker, nicely telling you to come back in a few months or 3000 miles. Lovely.