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.
Method 3 Changing Your Engine Oil. 1. Know how often to change your oil. How often you need to change your oil depends on the type of car you own. Some cars need an oil change every 3,000 miles (4,800 km), while others can go up to 10,000 or even 15,000 miles (24,000 km) without an oil change.