It has a timing belt. Click on the DIY sticky thread at the top of the forum page, and then click on Does Your Vehicle Have An Interference Engine link. That will take you to Gates.com, where you can plug in your vehicle information and it will tell you all the parts you'll need to replace the timing belt. Also, you might want to click on the Serpentine Drive Belt Replacement link in the same sticky as it has information and photos that may be of help to you. As for when to replace the belt, your owners manual should list that info. Nevertheless, 90,000 is typically the replacement mileage for a belt.