Hi, my name is Dean, I recently got a 2005 BMW (duh) 325i, my first BMW, need to know a little more about it. I have been turning wrenches, and building cars for 26 years, so Im comfortable w/mechanicals, just need techical info, like it has a 2.5l motor, does it have a timing chain or belt, and if it is a belt how often does it need to be changed? Im assuming it is an interference motor, so its cheap ins. to replace it. car has 108k now. any help and info would be grately appreciated!!