Human: Can I make money by converting my old car into a biodiesel vehicle? Assistant: 
Yes, you can make money by converting your old car into a biodiesel vehicle. Biodiesel is made from vegetable oil or animal fat and has become increasingly popular due to its environmental benefits. You can sell the biodiesel fuel produced from the conversion for more than regular gasoline. Additionally, there are many organizations that offer grants and subsidies to help offset the cost of converting an older vehicle.