My wife drove the Range Rover tonight for about an hour. When she got home, she turned the car off and then re-started it. When she did, a tremendous amount of white smoke came out of the tail pipes. It's a 2006 HSE with 140,000 miles on it. Never overheated, coolant levels remain constant. The smoke smelled plasticky almost. This happened to me the other day with a cold start. White smoke for a few seconds, then it cleared up. Thanks for any help.