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.
BMWs make use of lifetime fluids that are supposed to last the entire life of the vehicle. These synthetic fluids are much more expensive than the conventional variety, but can last up to 100,000 miles. Of course, if a person has purchased a used BMW then the automobile is closer to that mile marker. It is ordinarily recommended that transmission fluid be changed at approximately every 50,000 miles.