At this time you cannot buy a new diesel passenger car in (or outside of) California. Diesel cars must have at least 7500 miles at the time of purchase to be registered legally.

Diesel engines cost more to manufacture and usually last much, much longer. Higher mileage on a diesel does not necessarily equal a much lower value.

Diesels are especially rare in California, so you may not find what you want locally. If you do, you may be shocked at the high price. Check the blue book or NADA guide, and expect to pay a bit more within the state and especially in the Bay Area.

Ask about the number of keys, the car manual and any repair records. Get the VIN number and call the car's maker for dealer service history, recall data and any remaining warranty coverage.

Be prepared and act fast. Keep a hefty cash deposit on hand and find a mechanic ready to check out the car. If you buy from a dealer, you can usually place a deposit by phone.

Get a title report and a complete inspection by a qualified mechanic before buying. Most car sellers will cooperate with inspections. If any do not, beware!

If you can, avoid dealer financing. Your credit union or bank can usually offer you better rates.