I believe I'd wait awhile and get it. The Ford dealers recommend that you get the extended warranty before the "basic" warranty runs out. However, they will backdate it. There are various warranties available. Some are only powertrain warranties. So if you get a 5 yr, 100K mile warranty, it's for powertrain only after the basic 3 yr, 36K "bumper to bumper" warranty but does not go past 5 years or 100,000 miles, whichever comes first, so you only end up with 2 years and 64,000 miles of additional warranty. My oldest son bought a used 2006 Explorer a couple of years ago from a Lexus dealer and purchased an extended warranty through Lexus. The time and mileage were added to the basic Ford warranty. However he has any repairs done at a Ford dealership and it's still covered. The dealer basically files a claim with Lexus to get their money. If you go with a warranty company (not the one offered by the dealer) you need to check out their reputation because some of them are "fly by night" companies that take your money but won't pay the claims.