Shared cars allow for better maintenance, because the companies offering this service need to provide their customers a clean, safe car. Better maintenance in turn means that the cars that are in use produce only the minimal possible carbon emissions and do not leak dangerous chemicals, and the cars are kept in order to last for longer. Further, the companies can make sure that the oil and batteries are disposed of in an eco-friendly manner, the cars are cleaned with accepted cleansing agents, and equipped with the safest and best tires.