Good thing I have two computers. One for web browsing and another that has never been connected to the internet!!
TAKE THAT YOU GOVERNMENT SNAKES!
Text of the Privacy Act & Security Statement at cars.gov:
“This application provides access to the DoT CARS system. When logged on to the CARS system, your computer is considered a Federal computer system and is the property of the U.S. Government. Any or all uses of this system and all files on this system may be intercepted, monitored, recorded, copied, audited, inspected, and disclosed to authorized CARS, Dot, and law enforcement personnel, as well as authorized officials of other agencies, both domestic and foreign.”
.... my computer would be considered a gov't computer AND my information could be disclosed to both domestic and foreign agencies?
I
don't know what else to say except ...
OMG Dunno about this .... 
a car manufactured to need replacing in 5-7 years (more if your lucky), or a vehicle that is made to run as long as it's maintained?
Yes, only dealers may access this part of the website.
However, dealers still maintain information on people who bought cars from them such as:
Credit history
Bank Account information
SSN
Personal references (along with their home addresses and phone numbers)
Pretty much anything someone would need to commit identity theft.
The information will be available no matter if you participated in the program or not, if you bought a car from a dealer that is participating in the program your information is now property of the government and may be used and shared with domestic and foreign agencies.
