It may come to a surprise to many people who purchased diesels that they will need a smog test every two years. Beginning with model year 1998 to current. This is a new law that became effective January 2010 and there is no 6 year exemption as is the case with gasoline vehicles. So if you just purchased your new BMW X5d, don’t be surprised when you receive a smog requirement with that CA state registration notice about 21 months from now. We would not be surprised if the hybrids such as the Prius could be next to lose the 6 year exemption. How can that be? Well, in our opinion, the powers that be are apt to determine that those hybrid gasoline engines are not getting much maintenance attention, and spewing some unwanted gases out the pipe when they are running on gasoline vs. battery power. That may be another surprise.