Hazardous waste is waste that poses substantial or potential threats to public health or the environment. In the United States, the treatment, storage, and disposal of hazardous waste is regulated under the Resource Conservation and Recovery Act (RCRA).
Porsche recommends that the oil in the Boxster be changed every 15,000 miles as a part of the normal maintenance procedure. The recommended oil is Mobil 1 comes in several different grades. If you wish to change your oil more often and want to avoid some of the expense associated doing so, you can change it yourself.
Re: Oil Change intervals... Its just always been a basic rule of thumb to change the oil on any car every 3 to 5000 miles. But I baby my car like nobodys buisness so i change it every 2000 miles but that's just me : Give a man a fire and he's warm for the rest of the day.