The oil filter is found under the car, where the steering linkage goes from the wheels up into the frame. It is located about halfway into the "steering linkage tunnel" on the passenger side. Here is a more technical explanation: http://www.cadillacforums.com/forums/cadillac-forum/t-12323.html
Where is the oil filter located on my 2003 cadillac deville? I'm actually trying to locate the crankcase positioning sensor and its near the oil filter. Well, i cant even locate the oil filter? any ideas?