When we think about the amount of petroleum used in automobiles , we’re usually focusing in on the amount of fossil fuels that the car’s engine burns to generate power to move the vehicle. … Still more oil is used to lubricate the car’s internal workings, but there may now be a viable alternative on that last bit as the biodegradable motor oil from Green Earth Technologies, which is made from animal fats, has received the coveted API certification, meaning that it’s been …