Pulled out of the driveway drove about a 100 ft heard large clunking sound front end dropped down as if there was a flat tire pulled off the highway drove through the grass 100 ft back to my home the car started smoking from the engine compartment and burst into flames. Tried to extinguish with fire extinguishers and water hose while calling 911. Fire Department extinguished the fire. Car is a complete loss. There was an oil leak trail from where the car first drop down through the grass. The car did not have a previous oil leak. The car had 300,000 miles on it. No one was injured.