Prevent waste first! - Change motor oil every 7,500 miles, which meets auto warranty standards (rather than the 3,000 miles often recommended by service centers).
Recycling the motor oil from one oil change protects a million gallons of drinking water - or a year's supply for 50 people.
Reprocessing one gallon of used motor oil and burning it as fuel generates enough electricity to power everything in your home for a day.