It was my understanding that the skid plate under the engine had a square door about 5 x 5" held in place by 4 screws that allowed access to the oil filter without having to remove the entire skid plate. The service manual shows this door and I remember seeing it on a Titan at the auto show. But I just had a look at my KC LE 4x4 and it didn't have the door. Just one continuous skid plate. Do 4x4 models come with a different skid plate?