There's a link on the ad page titled "How to spot a scam" which displays, in part, the following:

Common-Sense Advice for Buyers

Buying a car you find online is a lot like buying a car through a classified ad in the newspaper. In either case, use your best judgment.
Know the car's market value
Be suspicious of a vehicle priced significantly below market value. If it sounds too good to be true, it probably is.
Obtain a vehicle history report
A vehicle history report can provide useful information, such as who holds the title to the car and whether the car has been in an accident reported to authorities. You'll also find out whether the car was ever reported stolen, salvaged or damaged.
Inspect the car
Schedule an inspection with a professional mechanic or an inspection service if the car is not in your area. An early inspection can help you identify problems. However, keep in mind that an inspection isn't a warranty and won't guarantee a car is free from defects or that inspectors have identified all existing problems.
Confirm contact information
Before you send payment, verify the seller's street address and phone number- an email address is not enough. ZIP codes, area codes and addresses should match up. Be wary if the seller is located overseas.
Use email wisely
Avoid sending sensitive personal or financial information (such as your social security number, credit card number or checking account number) to a seller via email. Remember that email communications are not secure and can be easily forwarded to others.
Get a detailed receipt
Ask the seller for a receipt that states whether the vehicle is being sold with a warranty or "as is."
Get title to the vehicle
Make sure you know what's required in your state to transfer title to the vehicle you're buying.